The compact control strip under the card preview on /pokemon-trainer-card-maker sets the card shape and the arrangement of the Pokemon and Badges groups. Ratio changes the card shape. Layout changes where the groups render.
Step 1

Find the control strip under the Download PNG row. The left side holds the Ratio and Layout dropdowns.
Step 2

Open the Ratio dropdown and pick one of the four shapes: Wide (8:5), Square (1:1), Portrait (4:5), or Story (9:16). The card redraws immediately.
Step 3

Open the Layout dropdown and pick one of the three arrangements: Float badges places badges inline with the card title, Stacked bottom places badges in a strip below the party, and Side by side renders party and badges in two columns.
Step 4

The Font buttons next to Layout switch the card typeface between Modern, Classic, Retro, and Mono. The Frames toggle hides the tinted tile borders around the trainer image and slots when turned off.
