The issue has been fixed in the latest release of InDesign – InDesign 2021.
Please update to this new version of InDesign to get the fix.
Adobe InDesign team
An error occurred while saving the commentMatt commented
When using Indesign the program occasionally loses focus and switches to focus on something else (possibly the Finder--I will need to watch next time). It becomes obvious when the pallets I have on a second monitor disappear, or when the main application window grays out in some areas. This happens on my MacBook Pro running Sierra as well as my coworker's MacBook Pro running High Sierra. Both of us have two external monitors connected via a hub and it's possible that is related. It also happens in Photoshop.Matt supported this idea ·