UIBuilder Local Text
 

From browsing around, it seems that local text is the variable to set whatever you want displayed in your UIBuilder selection. I'm attempting to mess with the fonts in the Journals tab. All the local text [DEVL} etc etc is set but it does not show up in the UIBuilder pane. All I'm getting is the main frame of the Active Journal helper.

if you want to see the other tabs, push the play button (sets it like in-game) and click the tabs labeled "complete" or "group", then click the play button again to turn it back into edit mode.
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