If I invoke Don't Sleep and then put the monitor to sleep (via active corners), my iMac Pro still goes to sleep according to the power save settings. This is probably because the DontSleep tool only sets PreventUserIdleDisplaySleep and not PreventUserIdleSystemSleep. You can check this via pmset -g assertions. In contrast, Amphetamine sets PreventUserIdleSystemSleep.
Can you please check and fix this?
Can you please check and fix this?