I tried to post this via feedback button but it doesn't allow me to attach custom screenshot so here we are.
As you can see in the screenshoot below:
This issue might also have an impact on the main menu dialog if users install lots of extensions.
My laptop screen resolution is 1366x768. Below that resolution (like cheap hybrid tablet/netbook) will definitely get worse.
Hopefully this get fixed soon before GA.
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to attach custom screenshot
about the issue, I guess Microsoft can solve it by making the menus that are out of screen scrollable (without scrollbar), so either with finger or with mouse scroll button.