System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1650 with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.30
Blender Version
Broken: version: 2.83.5, branch: master, commit date: 2020-08-19 06:07, hash: rBc2b144df395f
Worked: (newest version of Blender that worked as expected)
Short description of error
If Blender main window is maximized in windows 10, when you make render in a separated window. Main menu is hided. And only appears again when you exit maximized mode.
Exact steps for others to reproduce the error
Open Blender in windows 10
Maximize Blender window
Create a new scene with a simple cube, and make render. When render starts main menu is hided.

