I use Qt 5.13.2
Click e.g. new project, He comes up with no name project (changed) (translation from dutch)
I click search fuse, single pole. select with left mouse button, move to drawing erea, when I release the left mouse button he moves back to the place where I picked it up in the collection area.

I installed QElectroTech on Fedoro 31
It start up but if I try to place an element from the library on my drawing it moves back to the library and I cannot place it on my drawing.