It would be great if, like the tabs, the sidebar elements could also be opened in split-view by clicking/selecting or in some other way, for example, ALT + Click.
If you find examples of your feature request, take screenshots and post them, here.
This is Sidekick borwser. Unfortunately, it seems the development has come to a halt, but this browser has so far handled sidebar management flawlessly.
The other thing I don’t understand is, if Leo can open in split-view, why can’t the other sidebar elements?