Experiment don't want to start because of screen size

Builder
#1

OS: macOS Big Sur 11.0.1
PsychoPy version: 2020.2.10

When I want to start my experiment, this text is appearing in the Runner Box:

WARNING: User requested fullscreen with size [1024 768], but screen is actually [1440,900]. Using actual size

I already changed the size of the screen in the monitor Center, but it didn’t worked.

Thanks you for help.

#2

What the message is essentially saying is that you’ve told it (in the Monito Center) that your monitor resolution is [1024, 768], but your monitor resolution is actually [1440,900]. PsychoPy can’t change your monitor resolution, so is forced to use the actual resolution.

To change your monitor resolution, you’ll need to do so on your computer itself. Here is a guide for Mac: