I might just be doing it wrong but, i am starting, and i am in the beginning, mapping out my main walls. Done that. Then i added some cubes. done that.

Now i want to edit my walls, and i get to the mode where i can remove walls (that works) then I press A or B and it goes into wall making mode. And no matter which buttons i press, all i can do is make more walls, or "undo a wall" i cant close this wall making mode. how do i exit this? i have been at this for hours, the only way i can get out of it is by closing the app/game.

I have pressed every single button on my quest 2 controllers. nothing seems to exit this wall making mode. please help.

Hi, sorry, I've been meaning to rework some of this. 

In theory, it will save and exit Wall mode when you complete the circuit . Now, unfortunately there's a lot that can go wrong, and the system isn't realizing you've completed your walls, and you're stuck with no way out. I feel shame when I think of you standing in your apartment , with your new layout complete, unable to proceed. 

I'm trying to find time to get like 3 hours this week to make a new build, it's easy for me to just add another menu button as an override to force the completion state. I'm a circus performer as my main career and this week is really crazy with rehearsals for a new production. Normally I could have just added this feature as soon as I saw your comment, but it might have to wait another day or two. 

Oh no no, dont feel ashamed :) 
I am a solo dev too, coming from a different line of work. I know how it is ^_^

Take your time and focus on your main job first :) There is no rush ^_^ Just wanted to let you know and if you can implement a fix for this next time you work on it, that would be awesome, but really don't worry about it time wise :)

What part in the circus do you work in?  I LOVE the circus, sadly over here (Europe, Netherlands) there rarely are any circuses around sadly :(

This is still happening - at least to me.

This happened to me last night. The Quest 2 has been recently factory reset, running CHM 4.2 (released a couple days ago).