To enable darkmode in awork, go to My Profile > My Settings. There have the following options to choose from:
Off: Darkmode is always deactivated
Auto: Darkmode is active when your browser uses darkmode.
On: Darkmode is always activated
You are also able to turn darkmode on and off in your user*in menu by clicking on your image in the upper right corner.
☝️Note: In the mobile app, the dark mode is activated / deactivated according to your system settings on your mobile device.