Easy Fix for Overallocation & Underallocation Warnings in Disk Utility
I was getting a lot of overallocation warnings on APFS container. Then I started getting a lot of underallocation warnings on the HD & HD-Data volumes. I've never used Terminal, so was looking for a simpler fix. I started up in Recovery mode & ran Disk Utility from there. It fixed all the warnings.
I'm using a 2013 MacBook Pro running OS Catalina 10.15.7.
Earlier Mac models