Without a screen capture to guide my response, I will guess. This sounds like a graphics problem. Fusion 360, in recent updates, has changed how some graphic cards function. I would try two things. One is to make sure your graphics card is using the latest drivers. Two, I would try changing the Graphic Driver settings in your Preferences one at a time. You will have to restart Fusion 360 each time you change them so be sure and save your work.

Here is the way to find your Graphics Diagnostic panel.

John Hackney, Retired
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