Thanks Akito. Gparted looks too complicated for me to do at present.
Technicians in the computer repair shop set up the Windows/Ubuntu partition for me. I don’t know how to show you how all my drives look in gParted, and I’m not yet ready to attempt to make any changes to the partition. Too afraid I might lock up my computer … (and I can’t use my older computer for my recent 3D Blender files as they are too heavy for it). To access Storage I click on ‘Other Locations’ then Storage Space:
Looks like there’s still plenty of space there at least.
Plus, another little obstacle, on How to use Gparted on Ubuntu: The video called ‘My latest videos’ will not currently play on this computer with Ubuntu. I get the error message: This video file cannot be played. (Error code: 102630).