Em, resize the map. You prolly missed a step in the mapmaker wiki. Assuming I understood your complain.
EDIT: Based on img, I guess that is ithttps://www.warzone.com/wiki/Creating_the_SVG
Set the document size: Go back to "Document Properties" and under "Custom Size" set the Width and Height to about 900. Ensure the units says px (for pixels). You can adjust the size for your own map's needs. (Note about map sizes: Most maps work best when they're less than 1000x1000. If army numbers appear too small when you test your map, that means your map is too big and had to be shrunken down, causing the army numbers to shrink. Thanks to the magic of SVG, you can reduce the size of your map without losing any detail. If you're making a super large map, note that the maximum map size is 3330x2400.)
Edited 2/1/2020 03:23:00
Ensure the Scale is also set to 1 (both x and y), and ensure the viewbox is set to X=0, Y=0, Width=(same as your map width) and Height=(same as your map height).