Caffeine GNOME Extension Adds Support for Quick Settings, Timers
Older versions of the utility give you with a simple toolbar icon that you click on to enable Caffeine (to prevent your system from sleeping, or a screensaver from kicking in), and click on again to disable.
But the latest version integrates with the Quick Settings menu introduced in GNOME 43. It adds a “Caffeine” pod option that, like other Quick Settings pods, you can click on to enable/disable instantly.
There’s also a new sub-menu with one-click timers for 5 minutes, 10 minutes, and 30 mins, plus ‘infinite’ (which is default option)