These maps are now in the atlas. Thanks @Royal Scribe

The map has now been integrated into the atlas. Thanks for a great submission @HelenAA

Nice. That last one is great.

Ortho doesn't like when the snap grid is a hex grid. Right click ortho, and set the grid to any rectangular grid instead of that "user hexgrid", that should fix it.

Correct aspect ratio compared to the paper size you exporting to. For example, if you have a 1000x800 map, your aspect ratio is 10:8, but a standard A-size paper is closer to 10:7. So if you just blindly type in 297 mm for both dimensions, the exported image will be 297 by 237.6 mm, which is larger than the 297x210 mm of an A4 paper. (I didn't account for margins here)

CC3+ automatically calculates the other dimension based on the aspect ratio of your map, not the paper.

Of course, if you don't mind it getting a bit large and simply resize it down to fit the paper on print, then using the largest value works, but if you want it accurately, then you have to actually make your map in the right aspect ratio from the beginning, or you need to also calculate the lesser value so CC3+ can export an image that fits within both the dimensions.