Preview in UI personalisation interface

[Ardox]

When personalizing the game's UI, I'd sometime wish to be able to preview what it'll look like later. By example, it's hard to tell if the debuff/buff icons size just looking at the box, You can't tell if the Boss-Aether gauge will overlap with the limit break outsize a trial – you can't even set their position without changing mode..

[Arwen]

Yes. This please. Being able to see the interface you're tweaking under the UI personalization would be great.
Instead of tweaking on the fly during alliance raids... -guilty of doing this-