JabRef 4 Beta 3: symbols for (un)fold in groups view

I checked the Beta 3 of JabRef 4. The symbols for fold and unfold the groups in the groups view are on the right of the group name.

Technical question: Does the GUI lib offer a way to modify that and position the symbols on the left?

If yes I would suggest to put them there or to make it configurable. Because it is unusal to have them on the right side.