I've had trouble finding a guide to explain PCB vias to me. Primarily, I don't understand why the drill layer (44 in eagle) is the same size for vias of differing diameters.
In the image below, I have vias with different diameters (in mm) lined up. The (white) drill layer does not vary in diameter with the vias. I've tried changing various parameters of the vias and in the DRC file, but neither seem to change the drill diameter. I'm especially confused that for the 1.4mm via, which is greater than the drill diameter. What does the drill layer tolerance represent? How can it be changed and when should it be modified?