Compare
The compare mode can be started in 2 ways:
Starting a viewer session using the quick compare feature in the Assets module. See the article Quick Compare
From within a viewer session, starting compare mode.
Starting Compare Mode
By clicking the button “Compare”, a panel opens from the right of the screen. Here, two versions of the current asset can be selected to be compared to each other.

the compare button

selecting a different version to compare to
Once the selected version is loaded, compare can be clicked. The viewer will now be in compare mode.