On LaserWeb3 if i have a print space /engraving area of "15cm x 20cm"

On LaserWeb3 if i have a print space /engraving area of “15cm x 20cm” what would i set it as being in the Laserweb3 program as i am seeing it being the x and y-axis lengths?

150mm X 200mm

@Alex_Krause Thank you