The jump from OS/2 1.x to 2.x was rather huge, going from a joint IBM-Microsoft developed OS to a solely IBM one. Also on the original plan was to use what became the basis for Windows NT as OS/2 3.0. Neither of those two things happened.
Instead, IBM rewrote OS/2 from the ground up and produced a 32-bit product. Instead of using "NT OS/2" as the core for OS/2 3.x, it was just a minor revision of OS/2 2.x. Also, OS/2 3.x took on the name of OS/2 "Warp".
The OS/2 Warp splash screen.
Setting up OS/2 for the first time. This same control panel is located in OS/2 after setup as well.
The desktop is pretty much the same as OS/2 2.x, except it now has a "Launchpad". Similar to the CDE desktop, the Launchpad has Drawers which contain Objects. Of course, this is back before the taskbar was ever a thing.
It is possible to move the Launchpad around the screen, and close it. There is an icon located underneath it that allows you to launch it again.
It is possible to customize a drawer, and also add your own.