Minimize/Maximize/Close buttons disappear (Explorer, Outlook, etc).

Dear Community,

I have a problem and can't seem to find a solution.

On my Lenovo Thinkpad E13, after working for an hour or two, suddendly the Minimize/Maximize/Close buttons in the top right corner of any Windows Explorer window simply disappear. I can't do anything, except restart the Desktop Window Manager or restart my computer.

I have also tried:

• Change graphics configuration
• Change Project mode to Extended
• Made sur I'm not using Tablet Mode (not available on my Laptop anyways)
• I have no third-party apps
• I'm using stardard Windows theme
• Driver is up to date
• Windows is up to date

The buttons usually disappear when browsing in Chrome and then wanting to open an Explorer window by hitting WIN+E. After doing that a few times, the buttons disappear.

Lately the buttons habe also disappeared from Outlook after a while (I have Outlook 2019 installed).

I have two users on the computer:

• Admin
• Guest

So far, this issue only appears when I'm logged in as guest. As soon as the buttons disappear, if I log out and log in to Admin, then the buttons Minimize/Maximize/Close are there.

Does any one have any ideas what might cause this?

Thanks a lot in advance