It works slightly differently in elevation to what it does in plan.
In plan send to back will move a line to level 1.
In elevation it will go to level 6.
But press it again it will go to 5 then 4 then 3, etc.
Don't ask me why.
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