Hello,
in latest version of Archi theme, we have change option menu for service page, you easy change menu and order menu, tabs on service page.
1, Create a new menu for service page by go to Appearance -> Menus -> Select Service Post -> Add to Menu:
2, Check menu or tabs is show on frontend service page now:
3, You can also select the display location for the sidebar on the single service page, In your Archi Options -> Service Settings -> Service Single:
Thank you