Hi @user8611851,
Sorry to hear that InDesign is freezing after the recent update. I tested this on my end and couldn't reproduce the issue. Could you please confirm if you're using InDesign version 21.0 and share your operating system details? Also, let me know if the freeze happens only with certain files or whenever you open multiple documents.
If you haven't already, try resetting your InDesign preferences following the steps here: Reset InDesign Preferences. If the problem continues