Use "tab mechanism" from Branch Explorer sidebar in all other sidebars
The Branch Explorer "Options" sidebar has its "tabs" in a vertical layout, which works better when there are several tabs. Other sidebars (in the Branches and Changesets views) use horizontal tabs instead. It would make sense to unify these so the same type of sidebar component is used in all these places.
Additionally, I think the "View History" view should have a sidebar as well...
Our plan is to redo the windows GUI and implement what we already have on Mac and Linux… which is exactly what you’re asking for :-)