Can the right columns be hidden to use more space for the signal?
Yeah, things are getting a bit crammed on that little screen.
It's not about size. It's about pixels.
At first glance the columns on the right take up say 180 pixels. That leaves 900 for signal.
So it approaches the DHO1000, which has 800 pixels horizontally.
If the full width can be used for signal, it will make a significant difference.
Now I hope the point of the question is understood.
Later edit : nope, it takes from 1920, not from 1080. DHO has 1280 horizontally. So It's OK