Calem Dark Mode will be available in the coming release of R2022e (Q3/Q4 2022). Dark Mode may have health benefits (see this article) including the following.
Here're the screenshots of the Dark Mode.
The screenshots of the Mint Theme, and the Classic Theme are shown below for a comparison with the Dark Mode.
The screenshot below is the Classic Theme with modules docked at the top of the screen.
1. Switching to Dark Mode
The dropdown menu from the top-right corner of the Calem Desktop allows one to switch to the Dark Mode from either the Mint or the Classic Theme.
2. Modules at the Top
The Dark Mode docks the modules at the top. It does not support modules in the left side. The docking option of modules is available for the Mint and Classic Theme.
The screenshot below is with the Mint Theme with Modules at the left side of the screen. You may compare it with the screenshot of the Mint Theme above for the differences of modules docking and layout changes.