Based on Squintina's layout, but with tweaks that fit my brain better. ST on chotbar 1, AoE on chotbar 2. I hit R1 (right bumper) to change to the AoE and sit on that chotbar as needed. Since RDM is my Eureka job, I have Eureka Potion set to chotbar 3, LDU.

I created my chotbars to be comfortable, practical, and aesthetic.(to me anyway) Nearly all same/similar skills are in the same position across all jobs/roles while allowing for as little finger gymnastics as possible.

My XHB is split between chotbars 2(left) and 7(right)

Lvl 100 Red Mage XHB made by a ps5 player

for each job, I create a "hotbar" that is basically a monitor for cooldowns/any spell/skill I want to see the status of; I also have a hotbar with Role spells & skills, and, Sprint. I would add Second Wind in the missing slot. I use Hotbars 2 & 10 but you can use any Hotbars you want.

for RDM, there are only 6 spells, so you could put them all on 1 column; I don't do this because of how I have my UI setup to accommodate multiple job setups.

Updated for Dawntrail

Buttons consistent for similar job actions (Dye = Potion)

Might change this

RDM as of 6.5

Single Target (L)

Mobs (R)

Hotbars for Lv60 Red Mage.

Pot goes on Bar 3 Down D-Pad Raise uses Macro

Probably a WIP

Hotbar 1: White mana on the left side, black mana on the right side. Single target above, AoEs below. Both/neutral down the middle. I used to put acceleration on Hotbar 3, but it's better this way for quick succession to the relevant actions.

Hotbar 2 (ctrl): The 1-2-3 melee combo on top. I usually have my gap close/make on those two middle positions. Sleep, lucid, cure, and the DPS buff are just rollovers from my old hotbar as Summoner, my first job, and that was before I put more thought into hotbar setups. AoE and run+gun spenders on the bottom row.