Increasing UI font size for the dark theme

[Amile]

Hi,

I'm new to XnView (former IrfanView user), so please forgive any obvious blind spots.

The default font size is almost unreadable for my old eyes with my high resolution monitor.
I am trying to increase the overall UI font size and can't figure out how to do it.

Here's what I've tried:

1. Created a custom theme and injected a specific font size * { font-size: 15px; } to the CSS.
This works, but then I lose all the color settings of the dark theme, and can't find how I can copy them over to the custom theme.
If there's a way to copy / paste or force all the dark theme color settings into the custom theme editor, that would be great.
I've looked in the application folder for an obvious CSS files, nothing.
Tried injecting it into the Win...QSS file, that didn't work either.
BTW - an unrelated bug (?) - after setting the custom theme, I can no longer edit the theme properties; the editor window doesn't come up again.

2. Tried to force 1.25 scaling via Windows, both through the shortcut properties with "-platform windows:scaleFactor=1.25" flag, and by overriding the high DPI default settings in the shortcut properties.
Both did not work and XnView continues to use tiny almost" unreadable fonts regardless of my settings.

Your help will be highly appreciated, as this is a deal breaker for me.

Have an amazing day!