It's weird but there are effectively two "control panels" in Windows 10 (much like was the case in Windows 8.1). There's the traditional Control Panel and one called "Settings". The one you want is "Settings" and it's accessed through the "Start Menu" > Settings > System > Apps & features.
This will allow you to remove "Apps". The one through Control Panel I think only allows you to remove desktop software. Below pic shows 3D Builder with an uninstall button along side it, to show I'm not making it up!!
Thank you! Never having had a computer with Windows 8 or 8.1, I did not know this. I will try what you suggest.
Meanwhile, experimenting with the new-to-me Windows 10 user interface, I discovered another way. The "bloatware" or which I complained made its presence known when I clicked the start button: as "tiles" to the right of the more traditional start menu. If I right-click on on these tiles, I see a menu which -- for some tiles, but not all -- includes an "uninstall" option. By clicking on "uninstall", I was able to persuade Windows 10 to actually uninstall the 3D Builder app. Likewise for the Solitaire game app.
For some of the tiles, however, those for applications that are more intimately associated with the Windows 10 OS, the "uninstall" item does not appear in the right-click menu. For those, however, I can click on "unpin from the start menu" and at least they do not intrude on my user experience.