Undescriptible Sub Window Size issue

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Hello to the UE4 community, I have a real “size” problem and I hope someone has a solution for me.

When UE4 opens a sub-window as you can see on the screens: to choose color, import img, create new blueprints(, etc… all the sub-windows), the size of the window is much too large and I therefore cannot modify the parameters of this window.

Impossible to stretch or shrink the window with the mouse obviously.

I have two screens of similar resolutions and, I had not had this problem before and I only see this in my current project.

Thank you for taking the time to help me.