Recently I spent a lot of time trying to fix the display orientation (image was flipped 90 deg on TV) when connecting the Legion Go to a TV. It really is a hit or miss, especially when changing the resolution. It seems to be a known issue according to this video:
.I understand this has to do with the Legion Go's native portrait orientation, but I wish a fix could be included in a future patch to address this situation and make it more plug and play into monitors and TVs. I frequently play with the Legion Go hooked to a TV.
On a side note, I think the Legion Go is a beast and the customer support team is amazing. Congrats!