Dreamebot - clean vertical and not horizontal

I have my Dreamebot L10s Ultra set up and all working.
I saw that if I do 2 repeats on a room, it will clean first time regularly (horizontal) and the second run will be vertical.
Can I somehow make it go vertical on first run? I didn’t find any control or setting for it.

Latest vacuums has setting for this but older vacuums determines first cleaning orientation by looking at the room dimensions. So you can split your room into two and modify its dimensions for changing the cleaning direction.