How to move elements into a pre-existing group (without drag and drop)?

How can I nest elements into an existing group directly? (Like using a dropdown selection or something similar).

I have been using drag and drop to move elements to specific groups sometimes, but it is often really difficult, especially now in the new responsive editor. It feels like a really unnecessary difficulty when I wish I could just assign them to a group without trying to drag and drop into specific spatial boundaries.

I searched but can’t haven’t been able to find another posting on this.

Any guidance is appreciated!