I've fixed it, please update to the latest version. The reason is the theme was using o-get-most-contrast function and it has recently changed (https://github.com/odoo/odoo/commit/566cece592b4c711b655a7445ed454afc6ced46a#diff-fa19ebdf2b81a5e6249fba4252637cc4) Thank you

The style compilation failed, see the error below. Your recent actions may be the cause, please try reverting the changes you made. Error: wrong number of arguments (6 for 3) for `o-get-most-contrast' on line 1353 of /stdin >> @return o-get-most-contrast($color, $yiq-text-light, $yiq-text-dark, $back ------------^ This error occured while compiling the bundle 'web.assets_backend' containing: - /web/static/lib/bootstrap/scss/_functions.scss - /web/static/lib/bootstrap/scss/_mixins.scss - /polaco/static/src/scss/utils.scss - /web/static/src/scss/bs_mixins_overrides.scss - /polaco/static/src/scss/primary_variables.scss - /web_editor/static/src/scss/web_editor.variables.scss - /mail/static/src/scss/variables.scss - /portal/static/src/scss/primary_variables.scss - /website/static/src/scss/primary_variables.scss - /website/static/src/scss/options/colors/user_color_palette.scss - /website/static/src/scss/options/colors/user_theme_color_palette.scss - /website_blog/static/src/scss/primary_variables.scss - /polaco/static/src/scss/secondary_variables.scss - /website/static/src/scss/secondary_variables.scss - /hr_org_chart/static/src/scss/variables.scss - /account/static/src/scss/variables.scss - /polaco/static/src/scss/bootstrap_overridden.scss - /web_editor/static/src/scss/bootstrap_overridden.scss - /web/static/src/scss/import_bootstrap_part1.scss - /web/static/src/scss/bs_mixins_overrides.scss - /web/static/src/scss/import_bootstrap_part2.scss - /web/static/lib/tempusdominus/tempusdominus.scss - /polaco/static/src/scss/webclient_extra.scss - /web/static/src/scss/webclient_layout.scss - /web/static/src/scss/webclient.scss - /web/static/src/scss/domain_selector.scss - /web/static/src/scss/model_field_selector.scss - /web/static/src/scss/progress_bar.scss - /web/static/src/scss/dropdown.scss - /web/static/src/scss/dropdown_extra.scss - /web/static/src/scss/tooltip.scss - /web/static/src/scss/debug_manager.scss - /web/static/src/scss/control_panel.scss - /web/static/src/scss/fields.scss - /polaco/static/src/scss/fields_extra.scss - /web/static/src/scss/views.scss - /web/static/src/scss/pivot_view.scss - /web/static/src/scss/graph_view.scss - /web/static/src/scss/form_view.scss - /polaco/static/src/scss/form_view_extra.scss - /web/static/src/scss/list_view.scss - /web/static/src/scss/list_view_extra.scss - /web/static/src/scss/kanban_dashboard.scss - /web/static/src/scss/kanban_examples_dialog.scss - /web/static/src/scss/kanban_column_progressbar.scss - /polaco/static/src/scss/kanban_view.scss - /web/static/src/scss/kanban_view_mobile.scss - /web/static/src/scss/web_calendar.scss - /polaco/static/src/scss/search_view.scss - /web/static/src/scss/search_view_mobile.scss - /web/static/src/scss/dropdown_menu.scss - /polaco/static/src/scss/search_view_extra.scss - /web/static/src/scss/data_export.scss - /base/static/src/scss/onboarding.scss - /web/static/src/scss/base_settings.scss - /web/static/src/scss/report_backend.scss - /base_import/static/src/scss/base_import.scss - /web_diagram/static/src/scss/diagram_view.scss - /web_editor/static/src/scss/web_editor.common.scss - /web_editor/static/src/scss/web_editor.backend.scss - /mail/static/src/scss/announcement.scss - /mail/static/src/scss/discuss.scss - /mail/static/src/scss/abstract_thread_window.scss - /mail/static/src/scss/thread_window.scss - /mail/static/src/scss/composer.scss - /mail/static/src/scss/chatter.scss - /mail/static/src/scss/followers.scss - /mail/static/src/scss/thread.scss - /mail/static/src/scss/systray.scss - /mail/static/src/scss/mail_activity.scss - /mail/static/src/scss/activity_view.scss - /mail/static/src/scss/kanban_view.scss - /mail/static/src/scss/attachment_box.scss - /partner_autocomplete/static/src/scss/partner_autocomplete.scss - /website/static/src/scss/website.backend.scss - /website_theme_install/static/src/scss/website_theme_install.scss - /calendar/static/src/scss/calendar.scss - /sales_team/static/src/scss/sales_team_dashboard.scss - /mass_mailing/static/src/scss/mass_mailing.scss - /account/static/src/scss/account_reconciliation.scss - /account/static/src/scss/account_journal_dashboard.scss - /account/static/src/scss/account_dashboard.scss - /account/static/src/scss/section_and_note_backend.scss - /payment/static/src/scss/payment_acquirer.scss - /sale/static/src/scss/sale_onboarding.scss - /sale/static/src/scss/product_configurator.scss - /website_sale/static/src/scss/website_sale_dashboard.scss - /website_sale/static/src/scss/website_sale_backend.scss - /website_sale_link_tracker/static/src/scss/website_sale_link_tracker.scss - /project/static/src/scss/project_dashboard.scss - /stock/static/src/scss/stock_traceability_report.scss - /note/static/src/scss/note.scss - /hr/static/src/scss/hr.scss - /hr_attendance/static/src/scss/hr_attendance.scss - /hr_recruitment/static/src/scss/hr_job.scss - /board/static/src/scss/dashboard.scss - /im_livechat/static/src/scss/im_livechat_history.scss - /maintenance/static/src/scss/maintenance_team_dashboard.scss - /gamification/static/src/scss/gamification.scss - /event/static/src/scss/event.scss - /hr_org_chart/static/src/scss/hr_org_chart.scss - /sale_timesheet/static/src/scss/sale_timesheet.scss - /web_settings_dashboard/static/src/scss/dashboard.scss

I've supported mobile friendly for this theme. Let's take a look, any issue please contact me, I will fix as soon as possible. Thanks.

Hi David, we will fix it soon

This theme does not display submenus on mobile devices, fixing?