How to change colors in sources of Audacity?

Hello,
can you please help me to change (at least) the colors high contrast needed. Black background and very very light colors for text.

I am using Mint 21.3

I tried to change libraries/lib-theme/Theme.h

enum class PreferredSystemAppearance
{
    HighContrastDark,
    Dark,
    Light
};

this does not change the content of the Windows.

Also the text of the menu, can I make it a bit smaller?
There are some controls which could be a bit smaller too… Can I change this in the source?