Talonos is correct,

I was tired and forgot to place a red box around the "Reset module configuration" and "checkbox".

What you see in the image should also be the default settings, I activated several months ago and walked away

Additionally: What version of PhPBB are you running?

I believe that I am also in favor here, not just both sides, but to choose left only Right Only or both.
Especially as I am moving to a screen wide Style, and most of my viewers are1920x1080, this should be an appropriate suggestion.