@elextr thanks for the reminder. I completely forgot about this.
I see the setting in https://github.com/geany/geany/blob/90c6096ed6ea167f9100ce8f74229a3f47acc29a... and https://github.com/geany/geany/blob/90c6096ed6ea167f9100ce8f74229a3f47acc29a... but I don't have a clue as to how to make this an editable setting. I'll unassign myself and open this up for someone else.