The toggle switch between the dark mode and the light mode is in the top right-hand corner of all 3 consoles: interpreter, technician, and client.
The dark mode is enabled by default and it may be easier on your eyes especially for longer events. However you can switch to light mode at any time if necessary.
Switching between the dark mode and the light mode does not change any console functionality.
Some colors/buttons may look different to make using the consoles easier.