I've installed the Indesign 2021, everytime I try to launch it it will come up as a blank tab. My mac is up to date and I've reinstalled indesign countless times. Help?
Try resizing the application window. That sometimes jolts the display into action.
Have you tried resetting the InDesign preferences ?
Reinstalling isn't going to help.
As suggested try reset your preferences.
If that isn't working the correct way to reinstall is with the CC Cleaner tool. https://helpx.adobe.com/ie/creative-cloud/kb/cc-cleaner-tool-installation-problems.html
Sorry to hear about your experience. In addition to the suggestions given above, I'd recommend checking out this community post(https://community.adobe.com/t5/indesign/advanced-troubleshooting-for-launch-issues/td-p/11394034?pag...) & let us know if it helps.