2020 Pages Window Broken
Ever since updating to Indesign 2020 the pages window just doesn't work. I've tried uninstalling and reinstalling a number of times but no matter what I do it just shows it as completely blank. This makes it extremely difficult to access anything, let alone my master pages.
Have you tried trashing the Application’s cache and Preferences? Please try that and see if the issue goes away.
Adobe InDesign team