I don't think "Draw Extra Handle Lines" is a good name here. It's long and not super descriptive. I also think it's a bit of a strange option to be able to just show more height offset lines. I think we should just have the option to toggle height lines instead (called "Height Lines") and when they are on we can show many like you do when Draw Extra Handle Lines is on.
Also please use a checkbox for the control so it looks the same as "Local Mode", they are shorter which is why I used them for Local Mode.
In the future we can make two little icons for Local Mode and Height Lines and they can just be toggled on and off and it will be much shorter and neater.
The height offset lines do not act correctly for me in certain cases: https://user-images.githubusercontent.com/4955051/131244257-ea4a2626-f7f1-49a9-9657-ce50aad9acc8.mp4
Also please use a checkbox for the control so it looks the same as "Local Mode", they are shorter which is why I used them for Local Mode.
In the future we can make two little icons for Local Mode and Height Lines and they can just be toggled on and off and it will be much shorter and neater.