Fairly standard alignment shortcuts are command+shift+[ or ] or \
I am quite certain that the previous version of DT kept these, but today as I was trying to format my text, I noticed that some have changed, and others have no shortcut key at all.
DEVONthink can’t use standard shortcuts for all commands it’s providing due to several conflicts. However, you can change all shortcuts via system preferences.
I still suggest relinquishing Shift-Command-Y and Shift-Command-K shortcuts for reassignment to more frequently used commands.