I don't think that would work Yoshidude, it would end up taking his screen to the northeast from where he is already at. I had thought of that earlier. He'd be appearing on the 4th row down, instead of the 5th row.
What I am thinking though Lynker, is that you need to go to your Quest menu, and go to DMaps, select whichever DMap that is giving you the issue, and under the map, should be a bar that you can adjust the map, slide that to the left or right, and figure out where your starting room is within that map there, because you can't put in the number of the actual screen it's on. Figure it out on that map, and put the new number in that spot.
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It might actually be slightly different looking, because I am using a 2.5 Build, and you said you are on 2.10.2, but you should get the general concept. The map on the left is where you need to determine what the number of the screen you want to start out on. Hope this helps you out.