Drag and Drop from one collection to another (not copy)

I want to sort my Fonts into Collections. I have one collection called “All Fonts”.
And I want to get all my fonts into this collection and than sort them into different other collections.
So I can see, wich font isn´t sort into a correct collection.

But my Problem is: I can drag and drop the fonts from f.e. “All Fotns” → “Serif”.
But the font is now in both collections “All fonts” AND “Serif”.

Is it possible to move the font and not to copy it.

Thanks for helping me out.

Hello @valkier, thank you for the post, welcome to the forum and sorry for the delay.
The scenario you’re describing is what can be done using folders and their hierarchy.
Have you had the opportunity to check out the tutorials we have up on Youtube?

They might answer some of the questions you might have.
If you need collections specifically, then it is not possible to do this at the moment, but it sounds very similar to this feature request:

Hope this helps,
FontBase Dev Team