Thank you for your patience all this while.
This issue is now fixed in the latest update (Id 14.0.1) of InDesign CC.
If you are unable to see the update notification yet, open the menu (three dots) from the top-right of Creative Cloud desktop application and click on ‘Check For App Updates’.
Once the update button is shown against InDesign CC, click on the button to update your InDesign to Id 14.0.1 for the fix of the issue.
Do let us know in the comments, if you face any problem with the new update.
List of fixed issues can be found at: helpx.adobe.com/indesign/kb/fixed-issues.html
An error occurred while saving the commentSteve S. commented
After this 2019 update, InDesign stalls after startup and on the use of first tool of the session. 30-60 seconds of lag. No indication of "processing." Just no response - like it is loading that first tool. After, all tool work fine and workflow is normal. New document, no problem. Happens with all FIRST-use sessions, first program load of the day, not every document.
InD-14.0 on Win-10p