Questions about mapmaking in Heroes 6.

Hello. I have the following problem. For example, I download a map and want to expand it, or, for instance, change the outlines of the land. If I place any neutral creatures outside the land area (and generally outside the original terrain configuration of the map), which was there initially, then in test mode (or just in the game), they appear, the number and type of creatures are displayed, but when I click the battle button, the battle itself doesn't start. It doesn't enter the battle mode at all (the sound of the battle starting plays, and then it kicks me out). I've tried many things, but it seems to be related to the terrain. It's definitely not in the settings of the neutral unit itself. But no matter which tools I use from the terrain panel, nothing helps. I like large maps, but there aren't many of them, and I would like to enlarge some existing ones. I'm sure the solution is simple. By the way, regarding the problem mentioned by Uchiha_Madara: there is a fullscreen mode, but there is no minimap, as far as I understand. I have to manipulate the tools in the lower right corner.