I've played DROD - Architect's Edition some years ago. I'm not completely sure about it, but somehow I remember that there was a way to enlarge the small map to make it easier to find your way and find out which rooms you still have to clear.

I can't find such an option in DROD 1. Does it exist?

IIRC you click or double click on the mini map.

Yes, you are right. A double-click on the map did the job.

Thank you!

That doesn't work for me though.

Well, it doesn't exactly enlarge the map, but it shows all the rooms in the level you've already been to and also shows which rooms you've cleared and which ones still need your attention.

Ah OK but it still doesn't do anything. Nada!