First of all, kudos on the recent introduction of the vertical tab feature! It's a fantastic addition that helps maximize vertical screen real estate — something I and many others really appreciate.
I enabled hiding the tab list by default to gain even more usable space. While this does work well for a cleaner look, it does come with a tradeoff: losing visual cues for open tabs — like how many tabs are open or which one I'm currently on.
I suggest implementing a Tab Preview feature when pressing Ctrl+Tab, similar to how Windows shows app previews when you use Alt+Tab.