Indesign - Library not modifiable

Hi,

Sorry to hear about the trouble. Please try the steps shared below:

-Sign out of Adobe InDesign & Adobe CC Desktop app.

-Close Adobe CC Sync Services & other Adobe processes from the Task Manager/Activity Monitor.

-Reboot the computer.
-Sign back on the Adobe CC Desktop app & launch InDesign from there and check again.

If this doesn't help, please share the details asked above we'll try our best to assist.

Thanks

Rishabh

Can you be more specific to your issue?
what library?
What os? 
What version of InDesign?
Any screenshots to share?

Have you tried troubleshooting:
Try resetting your preferences:

Windows: Start InDesign, and then press Shift+Ctrl+Alt. Click Yes when asked if you want to delete preference files.
macOS: While pressing Shift+Option+Command+Control, start InDesign. Click Yes when asked if you want to delete preference files.
A dialog will appear asking to delete the InDesign Preferences, select 'Yes' on this dialog.
Further info and instructions here if needed:
https://helpx.adobe.com/in/indesign/kb/indesign-preferences-support-file-locations.html

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Reinstalling rarely fixes everything - you can do a complete reinstall using the
Creative Cloud Cleaner Tool https://helpx.adobe.com/creative-cloud/kb/cc-cleaner-tool-installation-problems.html