Size of object carved

Why are the actual items that are being carved on my Sainsmart 3018 Pro only about 1/2 the size I create in Easel?

You probably need to calibrate your steps per mm. And don’t run the setup as if you have an X-carve.

Microstep setting different (typical if the items carved is half or double true size)
Can be corrected by changing microstep setting OR changing your GRBL parameters $100 (X), $101 (Y) and $102 (Z)