Understanding Activity Monitor
Why is % GPU "always" 0.00 when GPU Time displays numbers like 11:45:05?
How does it indicate the usage of my Monitor?
Mac mini, macOS 10.15
Here is Apple's Guide https://support.apple.com/guide/activity-monitor/welcome/mac
If you click on Table of Contents it comes up with options to show documentation for Catalina as well as Big Sur and other versions of the MacOS.