I'm running version 1.5.8 of StellarMate OS. There are two boxes/buttons in the top/right that I don't remember seeing in past versions. They are labeled "Current Workspace "StellarMate 1"" and "Click to switch to "Stellarmate 2"". Nothing seems to happen when I click them.
They are two different desktops. You can have different programs running in each desktop and switch between them. Most if not all linux desktop systems have this facility.