sure/app/views/settings/preferences/show.html.erb

<%= content_for :page_title, t(".page_title") %>
<%= settings_section title: t(".general_title"), subtitle: t(".general_subtitle") do %>
  <div>
    <%= styled_form_with model: @user, class: "space-y-4", data: { controller: "auto-submit-form" } do |form| %>
      <%= form.hidden_field :redirect_to, value: "preferences" %>
      <%= form.select :locale,
          language_options,
          { label: t(".language"), include_blank: t(".language_auto") },
          { data: { auto_submit_form_target: "auto" } } %>
      <%= form.fields_for :family do |family_form| %>
        <%= family_form.select :timezone,
            timezone_options,
            { label: t(".timezone") },
            { data: { auto_submit_form_target: "auto" } } %>
        <%= family_form.select :date_format,
            Family::DATE_FORMATS,
            { label: t(".date_format") },
            { data: { auto_submit_form_target: "auto" } } %>
        <%= form.select :default_account_order,
            AccountOrder.all.map { |order| [ order.label, order.key ] },
            { label: t(".default_account_order") },
            { data: { auto_submit_form_target: "auto" } } %>
        <%= family_form.select :country,
            country_options,
            { label: t(".country") },
            { data: { auto_submit_form_target: "auto" } } %>
        <%= family_form.select :month_start_day,
            (1..28).map { |day| [localized_ordinal(day), day] },
            { label: t(".month_start_day"), hint: t(".month_start_day_hint") },
            { data: { auto_submit_form_target: "auto" } } %>
        <% if @user.family.uses_custom_month_start? %>
          <div class="text-sm text-warning bg-warning/10 p-3 rounded-lg">
            <%= t(".month_start_day_warning") %>
          </div>
        <% end %>
        <p class="text-xs italic pl-2 text-secondary"><%= t(".translations_notice") %></p>
      <% end %>
    <% end %>
  </div>
<% end %>
<% if Current.user.admin? %>
  <%= settings_section title: t(".currencies_title", moniker: family_moniker), subtitle: t(".currencies_subtitle", moniker: family_moniker_downcase) do %>
    <% selected_count_translations = t(".selected_currencies_count") %>
    <div class="space-y-4"
         data-controller="currency-preferences"
         data-currency-preferences-base-currency-value="<%= @user.family.primary_currency_code %>"
         data-currency-preferences-locale-value="<%= I18n.locale %>"
         data-currency-preferences-selected-count-translations-value="<%= selected_count_translations.to_json %>">
      <% additional_preview_currencies = @user.family.secondary_enabled_currency_objects.first(6) %>
      <% additional_currency_count = @user.family.secondary_enabled_currency_objects.count %>
      <div class="rounded-xl border border-secondary p-4 bg-container-inset">
        <div class="grid gap-4 md:grid-cols-2">
          <div>
            <p class="text-xs font-medium uppercase tracking-wide text-secondary"><%= t(".base_currency_label") %></p>
            <div class="mt-2">
              <p class="text-sm font-medium text-primary"><%= @user.family.primary_currency_code %></p>
              <p class="text-sm text-secondary"><%= currency_label(@user.family.primary_currency_code) %></p>
            </div>
          </div>
          <div class="md:border-l md:border-secondary md:pl-4">
            <p class="text-xs font-medium uppercase tracking-wide text-secondary"><%= t(".additional_currencies_label") %></p>
            <% if additional_preview_currencies.any? %>
              <div class="mt-2 flex flex-wrap gap-2">
                <% additional_preview_currencies.each do |currency| %>
                  <span class="inline-flex items-center rounded-full bg-surface-inset px-2.5 py-1 text-xs font-medium text-primary">
                    <%= currency.iso_code %>
                  </span>
                <% end %>
                <% if additional_currency_count > additional_preview_currencies.count %>
                  <span class="inline-flex items-center rounded-full bg-surface-inset px-2.5 py-1 text-xs font-medium text-secondary">
                    <%= t(".currencies_more", count: additional_currency_count - additional_preview_currencies.count) %>
                  </span>
                <% end %>
              </div>
            <% else %>
              <p class="mt-2 text-sm text-secondary"><%= t(".no_additional_currencies") %></p>
            <% end %>
          </div>
        </div>
      </div>
      <div class="flex justify-end">
        <%= render DS::Button.new(
          text: t(".manage_currencies"),
          type: :button,
          class: "md:w-auto w-full justify-center",
          data: { action: "currency-preferences#open" }
        ) %>
      </div>
      <%= render DS::Dialog.new(
        id: "currency-preferences-dialog",
        auto_open: false,
        disable_frame: true,
        width: "md",
        data: { currency_preferences_target: "dialog" }
      ) do |dialog| %>
        <% dialog.with_header(title: t(".manage_currencies"), subtitle: t(".manage_currencies_subtitle")) %>
        <% dialog.with_body do %>
          <% primary_currency_code = @user.family.primary_currency_code %>
          <% selected_currency_codes = @user.family.enabled_currency_codes %>
          <% base_currency_rows, other_currency_rows = Money::Currency.as_options.partition { |currency| currency.iso_code == primary_currency_code } %>
          <% currency_rows = base_currency_rows + other_currency_rows %>
          <%= styled_form_with model: @user, url: user_path(@user), class: "space-y-4", data: { action: "turbo:submit-end->currency-preferences#handleSubmitEnd" } do |form| %>
            <%= form.hidden_field :redirect_to, value: "preferences" %>
            <%= hidden_field_tag "user[family_attributes][id]", @user.family.id %>
            <%= hidden_field_tag "user[family_attributes][enabled_currencies][]", primary_currency_code, id: nil %>
            <div class="flex flex-wrap items-center justify-between gap-3">
              <div class="flex flex-wrap gap-2">
                <%= render DS::Button.new(
                  text: t(".select_all_currencies"),
                  type: :button,
                  variant: :ghost,
                  size: :sm,
                  data: { action: "currency-preferences#selectAll" }
                ) %>
                <%= render DS::Button.new(
                  text: t(".select_base_only"),
                  type: :button,
                  variant: :ghost,
                  size: :sm,
                  data: { action: "currency-preferences#selectBaseOnly" }
                ) %>
              </div>
              <p class="text-sm font-medium text-secondary"
                 data-currency-preferences-target="selectedCount"
                 role="status"
                 aria-live="polite"
                 aria-atomic="true"></p>
            </div>
            <div data-controller="list-filter" class="space-y-3">
              <%= render DS::SearchInput.new(
                placeholder: t(".currency_search_placeholder"),
                data: {
                  list_filter_target: "input",
                  action: "input->list-filter#filter"
                }
              ) %>
              <div data-list-filter-target="list" class="max-h-80 overflow-auto rounded-xl border border-secondary divide-y divide-alpha-black-100 theme-dark:divide-alpha-white-100">
                <p class="hidden px-4 py-3 text-sm text-secondary" data-list-filter-target="emptyMessage">
                  <%= t(".no_matching_currencies") %>
                </p>
                <% currency_rows.each do |currency| %>
                  <% checked = selected_currency_codes.include?(currency.iso_code) %>
                  <% base_currency = currency.iso_code == primary_currency_code %>
                  <label class="<%= class_names(
                    "filterable-item flex items-start gap-3 px-4 py-3 cursor-pointer transition-colors hover:bg-surface-inset",
                    "bg-surface-inset": base_currency,
                    "cursor-default": base_currency
                  ) %>"
                         data-filter-name="<%= "#{currency.iso_code} #{currency.name}" %>">
                    <%= check_box_tag "user[family_attributes][enabled_currencies][]",
                                      currency.iso_code,
                                      checked,
                                      disabled: base_currency,
                                      class: "checkbox checkbox--light mt-0.5",
                                      data: {
                                        currency_preferences_target: "checkbox",
                                        action: "change->currency-preferences#updateSelectedCount"
                                      } %>
                    <div class="min-w-0 flex-1">
                      <div class="flex items-start justify-between gap-3">
                        <div class="min-w-0">
                          <div class="flex items-center gap-2">
                            <span class="text-sm font-medium text-primary"><%= currency.iso_code %></span>
                            <% if base_currency %>
                              <span class="inline-flex items-center rounded-full bg-surface px-2 py-0.5 text-[11px] font-medium text-secondary">
                                <%= t(".base_currency_badge") %>
                              </span>
                            <% end %>
                          </div>
                          <p class="mt-0.5 text-sm text-secondary"><%= currency.name %></p>
                        </div>
                      </div>
                    </div>
                  </label>
                <% end %>
              </div>
            </div>
            <div class="flex justify-end gap-2">
              <%= render DS::Button.new(text: t("shared.cancel"), type: :button, variant: :ghost, data: { action: "DS--dialog#close" }) %>
              <%= render DS::Button.new(text: t(".save_currencies"), type: :submit) %>
            </div>
          <% end %>
        <% end %>
      <% end %>
    </div>
  <% end %>
  <%= settings_section title: t(".sharing_title", moniker: family_moniker), subtitle: t(".sharing_subtitle", moniker: family_moniker_downcase) do %>
    <div>
      <%= styled_form_with model: @user, class: "space-y-4", data: { controller: "auto-submit-form" } do |form| %>
        <%= form.hidden_field :redirect_to, value: "preferences" %>
        <%= form.fields_for :family do |family_form| %>
          <%= family_form.select :default_account_sharing,
              [
                [t(".sharing_shared"), "shared"],
                [t(".sharing_private"), "private"]
              ],
              { label: t(".sharing_default_label") },
              { data: { auto_submit_form_target: "auto" } } %>
        <% end %>
      <% end %>
    </div>
  <% end %>
<% end %>

<%# Preview features toggle — visible to all users, not just admins. Lives at
    the bottom of Preferences as a standalone card (no section header) so the
    toggle row is the entire surface. Posts directly to
    settings#preferences#update via the Settings::PreferencesController,
    matching the auto-submit pattern used on the Appearance page. %>
<section class="bg-container shadow-border-xs rounded-xl p-4">
  <%= form_with url: settings_preferences_path, method: :patch,
        data: { controller: "auto-submit-form" } do |f| %>
    <%# Wrapping the row in <label for=…> makes the title + description
        themselves a click target for the toggle, so the cursor-pointer
        affordance on the container is honest. %>
    <label for="user_preview_features_enabled" class="flex cursor-pointer items-center gap-4 justify-between">
      <div class="text-sm space-y-1">
        <h4 class="text-primary"><%= t(".preview.title") %></h4>
        <p class="text-secondary"><%= t(".preview.description") %></p>
      </div>
      <%= render DS::Toggle.new(
            id: "user_preview_features_enabled",
            name: "user[preview_features_enabled]",
            checked: @user.preview_features_enabled?,
            data: { auto_submit_form_target: "auto" }
      ) %>
    </label>
  <% end %>
</section>