Help with action bars / keybinds

Good morning all I'm trying to figure out how to have different key binds for different characters but still maintain my over all hud look. In other words lets say on my MNK I have a simple key bind set up such as:

1 2 3 4

and then underneath of those keybinds i have: shift + 1 under the 1 , and shift + 2 under the 2, and shift + 3 under the 3 and shift + 4 under the 4

Lets say I switch to Bard, the keybinds above will be the same for that class. How do I change this so that instead of having shift + 1, I can use lets say control + 1 under the 1 and control + 2 under the 2 and so on and so forth?

I would like to be able to change classes and have a different key bind set up specifically for that class. Is this possible?

Thank You.

The only way to do this is to use different /hudlayout where MNK uses, say, bars 1 and 2 while BRD uses bars 1 and 3.