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Also, ensure that you are in Expert and not Quick editing mode.

When Adobe applications act strangely, common advice is to try to "reset the preferences".

• To restore default preference settings, hold down Alt (Windows) or Option (Mac OS) while the application is starting. You can release the Alt key or Option key when the splash screen appears.

Mac or Windows and exactly which version of the operating system

Program version and any updates applied (my version 2021 is updated to 2021.4)

What has changed since you were able to open that window?

Have you updated your operating system?