Cannot Delete Variables in Class

[Toorah]

I created a new project in standalone netprints.
I added a new class, and a constructor.
Then I added a variable and a 2nd one.
Until now, I did not change any settings.

I wanted to delete the variables again, but I couldn't. The variables remained, even when I closed the class without saving.

Using Windows 10 Pro x64 (v1909)