Where is the first page with "1. Choose player sides" defined?

While monkeying about with adding and setting up a new map, there was suddenly no player side to choose when starting a new game. I could still press Finish and become Observer, and then press retire to choose another side, but something had caused the actual prompt to be empty.

I have not made any changes to player sides, and the new map is not limited to any player side.

I want to understand where this page is defined, and I have also seen some modules where the prompt has a background with the game cover, but I can’t find this definition, and I haven’t been able to find this cover among the images of the module.

I might go back to an earlier version for other reasons anyway, so this is not crucial, but it would be nice to know.

Bonus question: How can I change the size of this initial window? On my laptop a lot of modules use a window size for this window that is unnecessarily large. This means that the Finish button at the bottom is outside my screen, and the window can’t be scrolled, only resized. Fortunately, I have found that I can just press Enter, and that will execute the Finish command, but for the modules that I am modifying, I would like to resize it so that the Finish button is visible without resizing and moving the window.

I don’t think I could speculate on how this came to be without having the actual work-in-progress module.

In the Editor: Help node → Add About Screen (if it doesn’t already exist) → double-click [About Screen] to configure it and load in an image.

I don’t recommend loading a huge image here, as it will result in the giant window with buttons off-screen that you go on to describe.

Splendid! That was what I was looking for. I have already moved on to another method to do what I want, so I don’t have the actual problem any more, and if it is not something that makes experts instantly recognise it, then it doesn’t matter. If I retraced what I did, I might find out myself.

Do you have an idea for my bonus question?