It's very nice that in 2023 only one model/branch can be opened at the time per instance of TSF.
And when a tab is open it shows the model and branch:
I think it would be even better if it is also displayed on top of the TSF GUI:
This way it is also clear when no tabs are open 
and preferably (think it will automagically) also here:
Saves me from accidentally maximizing the wrong one when multiple models/branches are open.