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Because this is an Electron project, it's based in HTML/CSS/JS, which means you can do a few fancy things in the label fields as they are ultimately just inserted as CSS.
If you don't want a border or want to customize the background color's opacity and the like you can use rgba values in the colors. For example: set border color to:
rgba(0, 0, 0, 0) and you'll get fully transparent black, and it'll disappear. You can do similar things with font and background color.