Can I change my room plan in a particular stage of the trip?

I'd like to change the room plan on one stage of the trip, is that possible?

If you wish to change the room plan on one stage only, go to the desired stage and click on "Change accommodation":

Once the new window has opened, click on "Modify Room Plan" in the top right corner of the window and modify the room allocation:

Click on "confirm" to reload the hotel search with the new room type.