Try with a space or underscore in front of the single letters - i.e. _A, _B
That will force them to list first (depending on the sorting order in your schedule settings).
The same with numbers, you need 01, 02, 03 or _1, _2, _3 for when you get to double digits.
I don't like to use a space as you can't see it - I know that is the whole idea.
If you are comfortable with a space and you know it is there then that is fine.
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11