What CUSTOM menu allows me to change battle exp textbox?

I wanted to change the battle experience textbox that appears after defeating an enemy so that it is opaque. Currently mine is translucent. Is there a menu in CUSTOM for doing so? I can't seem to find anything like this.

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⊕ P E R S O N A L M U S I C: https://open.spotify.com/album/6fEo3fCm5C3XhtFRflfANr
⍠ C O L L A B M U S I C: https://dustpuppets.bandcamp.com/releases

It's not yet possible to change. Converting the battle UI to slices will allow it. And we're close to that!

Sounds good. No rush.

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⊕ P E R S O N A L M U S I C: https://open.spotify.com/album/6fEo3fCm5C3XhtFRflfANr
⍠ C O L L A B M U S I C: https://dustpuppets.bandcamp.com/releases