Having the same issue. I've tried all of the suggested fixes Adobe has - deleting folders, the library clean up tool, uninstalling/reinstalling AI - nothing fixes it.

For me only in InDesign 18.1 Mac...

I'm having the same issue. Just followed all the steps listed, and it didn't fix it.

Hi Nishreen,

So sorry to hear that.
Could you please try these following steps:
1. Delete all folders that start with “CC_LIBRARIES_PANEL_EXTENSION_xx_xx_xx” in this location: WIN: C:\Program Files (x86)\Common Files\Adobe\CEP\extensions MAC: Macintosh HD⁩ ▸ ⁨Library⁩ ▸ ⁨Application Support⁩ ▸ ⁨Adobe⁩ ▸ ⁨CEP⁩ -> extensions
2. Follow the steps from Solution 2 in this article: https://helpx.adobe.com/creative-cloud/kb/libraries-panel-not-working.html
Before trying the steps - please, make sure you've killed `Creative Cloud Libraries Synchronizer` process in Task Manager / Activity Monitor, as well as quitting all Adobe related products. This is mentioned in steps 1 and 2 of the article, but I wanted to point it out because it's important.

Please let us know if this didn't resolve the issue. Thanks for reaching out.

Regards,
Hari Vallabha
CCLibraries