Hi,
I understand what you are saying that you can’t click on it. When that happens to me, I have to make sure nothing else is selected and try again right clicking, and again.
Since it is a wall by itself, you may be able to “lasso” it or “Select Region” to select just that wall and then delete it. Worse case would be to delete it, then draw it again to put it where you want it.
Patience usually wins.
-Angie