Hi Jeff,
Thanks for reaching out to us. For your color, set the default width and height from here: https://paste.pics/P93FM
Then follow the tutorial to resize the size: https://youtu.be/xeT7byUaa7U
I hope this will help you to achieve your goal.
Thank You
Product page Swatch Size
Jeff Moss
Is it possible to set the size, most importantly the height of the size swatch separately from the color swatch size?
In my case I want the color swatch to be 70×70 to display the variant image correctly, but would like the size swatch to be 70×35