Rik, in MS Windows Explorer, paste in %localappdata%\Xara\WebDesignerPremium\11\Cache\de signs\eng\ into your address box.
It should resolve to C:\Users\Rik\AppData\Local\Xara\XtremePro\11\Cache \designs\eng\ if Rik is your windows logon nusername and open the file explorer showing all your design folders.

Select all of these and right-click and pick Properties.
You should get a summary of around 3,000 files and 100MB storage.

Let us know if you do not get this.

In Xara, click the Local designs gallery > Disc designs Button.
Enter the path of either of the two above and in the Add folder to gallery the Look in box should have eng and all the other folders will be with the Names of the design folders.
Click Add and accept all offers.

You should get a green folder with the long address you picked.
Expand and advise if you still are missing content.

Acorn