Pretty easily tbh , u just need to know how to edit the crossbar to make things easier

As many people pointed out in this discussion

L2 = 8 buttons
R2 = 8 buttons

In cross bar settings u can add more inputs with these commands but u must enable it for it to work, this will turn Ur cross bar 8 into Ur "back buttons"

L2 + R2 = 8 buttons
R2 + L2 = 8 buttons

U can also use R3 and L3 for macros , for example I have sprint macro to L3 and Focus target on R3

U can also set up your cross bar to only switch between 2 bars when Ur weapon is unsheathed which u can make it switch from cross bar 1 (single target rotation) and when u press R1 it will switch to crossbar 2 (Aoe rotation)

Like for example why would u need Aoe skills for single target rotation? That's just bloat, so u make 2 bars

Crossbar 1 single target rotation
Crossbar 2 Aoe rotation

And just swap back and forth between the two base on how many infront of u

Been around for 8 years and done near legit all content (prepping for endwalker for the past month now)