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This one is very strange! The window must exist but outside your screen...
Is it a problem that occurred after normal use or from the beginning?

Do you have a particular screen configuration (dual screen, recently changed screen)?
If so, you can try to delete the file that holds the last location of the window (among other things): C:\Users\yourUserName\AppData\Local\Paint Of Persia\User Data\Default\settings.json

Is it a problem that occurred after normal use or from the beginning?

-After normal use, but the last time I was in an unsaved project, the main tab crashed and did not allow me to save or close it (this has never happened before, despite having used it hundreds of times).

Do you have a particular screen configuration (dual screen, recently changed screen)?

-No, it is a simple laptop.

If so, you can try to delete...

-It worked!!!!!   :D 
I was all day yesterday trying to solve the problem, thanks for answering.  <3 :)
Is there a pixelart discord community to talk?

Great!

I'm not on discords dedicated to pixel art, I'm more on the side of video game creators, but it must exist!