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Why don't you just disable the scrollbar auto-hide? Or am I missing something?
Googling exactly that, it doesn't seem possible. The most recent post I found talks about making it taller and a different color, but being able to always show it is one of those features people want but nobody has implemented.
I was so going to rant about this a few months ago when I started using VSC (Visual Studio Code).
You explain the problem exactly. It takes a moment for it to appear and in that moment you click the edge of the window!!!!
It's so annoying!!!
XEROX PARC established visible scroll bars whenever the display area was larger than the window. This is a great visual that there's more information than can be displayed. Whoever decided it was a good idea to change this design is an idiot.
If you happen to have a mouse wheel you can use it to scroll horizontally by holding the shift key down. Saves a lot of headaches. (so beat me to this, I see now, oh well).
The delay for the hover to pop up can be adjusted in settings: "editor.hover.delay": 300,
For the love of God... If I needed the extra 20 pixels THAT BADLY, I would buy a LARGER Monitor.
Meanwhile the RIBBON is 30% of the height of the screen, and 4 times taller than the toolbars they replaced. Sometimes I think they are testing our patience!