Where did you hide the mask?
There was a mask here. Where is it now?

There was a mask here. Where is it now?

The problem was solved in a strange way. I wanted to find out which folder or file was responsible for the mask settings. I deleted all the files located in the root of this folder: Documents\Adobe\Premiere Pro\26.0\
But I left the Settings folder and other folders alone. When I launched the program, the files from the OneDrive folder were loaded, and the mask appeared!!!!!!!!!!!!!!! Now I can see the mask. All I had to do was delete and reload the files from the Documents\Adobe\Premiere Pro\26.0\ folder
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