Remove status dropdown in merged tab

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/20033

app/views/shared/issuable/_bulk_update_sidebar.html.haml

@@ -9,6 +9,7 @@
         .filter-item.inline.update-issues-btn.float-left
           = button_tag _('Update all'), class: "btn update-selected-issues btn-info", disabled: true
         = button_tag _('Cancel'), class: "btn btn-default js-bulk-update-menu-hide float-right"
+      - if params[:state] != 'merged'
         .block
           .title
             = _('Status')

changelogs/unreleased/20033-remove-status-in-merged-tab.yml

+---
+title: Remove status dropdown in merged tab
+merge_request: 37544
+author:
+type: fixed

spec/features/merge_requests/user_mass_updates_spec.rb

@@ -37,6 +37,15 @@ RSpec.describe 'Merge requests > User mass updates', :js do
         expect(page).to have_selector('.merge-request', count: 0)
       end
     end
+
+    it 'does not exist in merged state' do
+      merge_request.close
+      visit project_merge_requests_path(project, state: 'merged')
+
+      click_button 'Edit merge requests'
+
+      expect(page).not_to have_css('.js-issue-status')
+    end
   end
 
   context 'assignee' do