I created my own buttons for my toolbars because i don't need to group by every column AND because i didn't find how to aligne text on the left.
If at least we can align those buttons on the left i could just ignore buttons i don't use
If i can't align on the left,then i have to creat my own buttons and since they don't change automatically when i change folder i need the 3 toolbars with 3 different buttons i'm talking about here
The automatic list of groupable columns is intended to be in a sub-menu.
Having it at the top-level of a vertical toolbar will never be that great, since the toolbar (and everything else as a result) will keep resizing when the column names change.
Note that you can group by columns by right-clicking the top of the column itself and choosing Group, if you want a quick way to group by one of the visible columns.