Global options screen behaviour

When setting global options, on hitting "OK" the window disappears. This is confusing because one doesn't know what to do next. Maybe it should instead switch to "Repositories"?

We could also change the main app layout such that the Repositories tab is the main interface and the options are secondary.

Start by reviewing the global options screen and the Repositories interface to understand the current navigation after pressing “OK”. Clarify whether the intended result is switching to Repositories or redesigning the main layout, then define the expected window and tab behavior before making changes.

Written by the indexing model from the issue text.