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How to find the visual angle

I uploaded my experiment from an existing PsychoPy experiment that was originally for an fMRI. Now that I’m writing a manuscript, I’m realizing I might have to report the “visual angle”. Typically, this would remain fairly consistent for participants in the fMRI scan, but finding the visual angle for an online experiment is proving to be a little more complicated considering participants view the experiment on different screens.

Does anyone know how Pavlovia adjusts tasks to fit different size screens? Also wondering if anyone has tried to calculate the visual angle from their Pavlovia experiments before and if so, how?