I was able to do this quite easily in Wheezy, but I cannot find anything analogous to "windows settings" in Jessie. Mind you - I can add desktops with no problem, but they don't stick. Any help is appreciated!
Here is the website and instuctions that used to work:
To set up multiple desktops do the following:
Then Windows Settings;
From the Configuration manager choose Desktops in the left hand column;
Select the desired Number of Desktops;
Then click Close.
You now have multiple desktops, However, the GUI does not give any indication of this and you need to remember the keyboard shortcuts to use them: Ctrl + Alt + Left/Right will switch to the next desktop. To make this more usable do the following:
Right Click on the menu bar at the top of the screen;
Select Add/Remove Panel Items;
Select the Panel Applets Tab;
Click the Add button;
Choose Desktop Pager from the list;
Optional, choose Desktop Number/Workspace Name;
This will add a panel applet to the menu bar (far right by default) that will allow you to click and switch between the desktops.