Yes, it’s connected.
If you look closely you will see the uprights slide into schedule 20, 1" and held in place with a sheet metal screw. Remove the screw; lift or lower the screen. Send screw back in.
I limit the height of my plants: I try to get into the screen when the plant is about 18 or 20" tall. I supercrop to develop 4 distinct tops (FIM’ing) that I can weave into diagonal corners of the screen. Probably around week 6 or 7 in Promix. I don’t use the screen quite correctly but it allows access to side branches along with laying down main lines to turn horizontal nodes into vertical ones. Which all develop into a top. I populate the screen to around 90% before flipping.
Hope that helps. If you are interested here’s my journal: