If you are designing for a specific tile size, I would suggest adjusting the dimensions in the Super Tile editor to use that size.
With nothing selected in the Super Tile editor (eg. tap into the blank space), tap the gear icon to edit the Super Tile’s settings and adjust the base dimensions as desired.
The fonts scale with the base dimensions of the tile. So if you’ve built it as a 1x2 and then stretch it out to 1x4, all of the items will stretch to fit that space, but the font size wont change as the smallest dimension of the tile still hasn’t changed. But if you scaled from 1x2 to 2x4, for example, the fonts would scale to 2x the size along with the tile.