The skin Timeless shows a left and a right sidebar in wide windows, but dropdown menus in narrow ones. Some users and site admins would prefer sticking to a specific layout regardless of size and only scaling down if needed:
- Capping at single-column, where the menus are always dropdowns.
- Only one sidebar, for consistency with other skins like MonoBook/Vector, and avoiding confusion with where the tools will appear when often jumping between different resolutions on either side of the cutoff
Do these as user options, where the site can specify the default.