Well I just started using it, but I move the sled where I want to define home with my phone, then press the button that looks like save home under the z-axis button. On the laptop, think you can just drag the image around to place, but that function I haven’t been able to get to work on my phone. But the save home button seems more accurate.
While you can drag the board around to view it differently, You can’t drag the home position around. It only moves with the home position definition either the way you showed or the button just mentioned.