Can I delete objects at 'set' and multiseelction?

I want to delete multi object at ‘set’ but I can’t multiselect the object and delet object with my backspace key.

I think the fastest way to delete several objects is to open one, close one, open the next, and so on and then go to history, where you can select them all and delete them at once.

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Unfortunately this isn’t possible right now. But there are requests for doing this.
The way mentioned by mKay may for now be the fastest one.