I usually lay it down in a horizontal position at this time and bend the branches upwards.. watering is a bit more of a hassle, but the end result will reward your efforts.
Build a bigger wall (I am from germany, we had this as a solution for a few years)😉.
Outdoor plants usually start their flowering processes when they get less than 14 hours light. The 12 hours is the indoor "shure shot". Propably they had already a little preflower stretch. You do nothing completly wrong if you cut her back, supercrop her, or tie the branches down/spread them a bit out, Outdoor growing is most of the time growing with compromises.
Hello friend, spectacular plants, very healthy and beautiful, great grower, no problem cutting, as soon as you cut a couple of nodes, the autoflowering plant will slow down and start to get wider, happy growing friend 💚🍀🌱🍀💚
Those pots will limit growth soon enough... i'd wait to see if the problem takes care of itself.
If it absolutely can't be visible over the wall, just make sure you snap it down low enough, because the top will turn upward regardless of any remaining vertical growth in the tank.
I wouldn't prune.. just snap it down (HST or supercropping.. whatever stupid name is used for methods that existed long before marijuana growing hobby).
Good thing about outside, there's no difference in light intensity 24" further from the sun :P or even 1000 feet, lol.