Rebuild your preferences.
Problems within Panels can often times be fixed by deleting your InDesign Cache files.
To delete Caches:
For Macintosh Users: With InDesign closed launch a Finder Window in column view and click on your home folder. With the Option Key pressed choose Library from the Finder Go Menu. Within the Library folder find the “Caches” folder. Within the Caches folder find and delete the entire file “Adobe InDesign”. I find that deleting the cache file completely leads to a lasting change.
As I said, clearing all preferences and even clrear installation doesn't fix that.
And it is ridiculous reseting all peferences becouse of so many bugs. It's my five time this year I have to install previous version to working normally as so far it was possible.
As I tested, previus version of Indesign is working fine, even on copied workspaces and some preferences from latest release!
The cache files are independent of the preference files so deleting them could be worth a try. Also, reinstalling will not always solve problems if the background files—preference files and/or Cache files are corrupt.
All things that could be clear for Indesign were clear. NOTHING WORKS. It's just obvious it's another interface bugs, becouse it's another noticed bug for CC 2017 release. I can't count how many bug reports I had made this year so far. All small but mostly frustrating bugs when doesn't work things that was in my forkwlof becouse it worked well since the begining.
And it is always after anothe update, not becouse installing something else, since I keep my computer with Windows 10 for work clean from all unnecesary software.
Adobe make Indesign worst each time they do something. What is most frustrating, they broke things that just works. What is even worst, there is no alternative to change for to end this ridicolous "adventure" with Adobe. Monopoly make software worst, when there is no competition to improve product.
Just to be clear you deleted this folder right?
As Bill suggested it's usually the saved cache files that corrupt the UI not preferences. A reinstall wouldn't necessarily clear them.
If it was a bug, we would all see this. We don't. It is something unique to your system. Delete all preferences and caches, uninstall InDesign from the cloud app and reinstall from the cloud apo.