Part of the MAC Activity Monitor is missing

problem

method

killall "Activity Monitor"; sleep 10; rm ~/Library/Preferences/com.apple.ActivityMonitor.plist; sleep 5; touch ~/Library/Preferences/com.apple.ActivityMonitor.plist

• Exit the activity monitor process
• Wait 10 seconds
• Delete the configuration file of the activity monitor
• Wait for 5
• Create a new configuration file for an all-empty activity monitor