Current questions and answers regarding the map editor.

Yes, RMG is a random map generator.
"Just open" naturally opens it.
Somewhere in the depths of the parameters, which can be edited in Notepad, there must be something that, when changed, can make them single-player.
But that's secondary.

First, the primary question is that even initially single-player maps, the editor refuses to see when creating a campaign - the drop-down list is stubbornly empty. Accordingly, I have no way to create a campaign.

I checked the editor, and the list of maps to choose from for the campaign is not empty, but it doesn't contain all the maps that are there. Perhaps the campaign editor needs some condition for a map to be added to the campaign.

How can you play multiplayer maps as single-player? However, I have one option for this. Find your multiplayer map in the Maps folder, open it with an archiver, open the 'Maps' folder, and rename 'Multiplayer' to 'SingleMissions'. But how it will work...