Open Settings
Go to System
Select Power & battery
Set Sleep to Never
Set Screen and display timeout to Never or a longer time
Check advanced power settings
Set sleep, hibernate, and lid close actions to do nothing if needed
Keep the computer plugged in if power settings differ on battery
Disable screen savers or lock settings that trigger sleep
On a Mac, open System Settings
Go to Lock Screen or Battery
Set display and sleep options to Never or a longer time
On a Mac, check Energy Saver settings if available
Keep the device awake with a power management app if allowed
Restart the computer after changing settings if needed