Thank you for your support. The issue is now fixed in the latest update of InDesign.
Please upgrade to the new InDesign 14.0 from your Creative Cloud Application.
If you are unable to see the update yet, click on the menu (three dots) on the top right corner of Creative cloud app and click on “Check for App Updates”.
Let us know your feedback in the comment section.
InDesign TeamPhilippe commented
Please make Indesign great again! Since CC I've been experimenting this infuriating problem. Panel button just stop responding randomly... And every time this happens, I restart Indesign or I activate the Application frame to resolve this... another common problem appears: the selector icons of the layers panel disappears... The only "solution" so far is to trash the preferences... but that IS NOT a solution, 'cause I causes more problems... It take time to set up everything back; menus, PDF export settings, preflights settings... and so on.
This BIG issue is constantly happening through OS versions and Indesign Updates. It appears Adobe can't find a real solution, and It's getting really unbearable.
This kind of things happens when a Company doesn't have any competitors. It's so sad. I used to be a big fan of Indd.