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Also: As with effect icons the scale of your map etc. affects that label, too (especially the size of the grid). When that happens and it becomes too big or small, then rightclick on a token and release the scale. Then by scrolling in and out and by changing the size of the token you can change the relative scale :) (First change the size of the token until the relative measure fits, then zoom in and out until the token covers the correct area of squares; then lock the token scale again) So the standard procedure you have to do as with effect icons
Basically, the font size depends on the resolution of your map, too. Smaller resolutions/grid sizes in pixels cause bigger height labels :)