I am not exactly sure of the problem you are facing now.
You can cancel the SEO by clicking the 'X' next to each one in the list.
But this only cancels the connection.
The walls and beam you used for the operators are still there.
As it seems you have used walls and beams as the operators, these will automatically interact with the main wall - an automatic SEO if you like.
Even when the layer is turned off.
That may be why you are still seeing lines on your main wall - if that is the problem you are now experiencing.
You can delete those small walls and beams for good (or move them out of the way),
Or if they are in a separate layer to the wall, you can change the layer intersection number of each layer (in the layer settings) so they are different to each other.
If that number is different then no automatic trimming will occur.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10