Is it possible to customise the theme of the Scene Builder itself?

[Mailing User]

I have downloaded the latest version from a website called Gluon or something. The problem is that the default theme lacks contrast. It looks like grey text on light grey background. Also the font is too small for me. In File -> Preferences, I can see "Scene Builder Theme", but it only has two themes: Default and Dark. The Dark theme also lacks contrast. It looks like grey text on dark grey background.

Is there any way to change the colours or the font size of Scene Builder itself, NOT the scene of my application that I am editing with Scene Builder?