Toggle Groups (Alt + G)?
That is it.
Rectangular and chained walls are in fact single walls that are grouped.
Turning the grouping on/off will allow you select individual walls or the group that was drawn with the rectangle or chained command.
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