I defined my own listing mode and I'd like to make it permanent so that on the next mc start my defined listing mode will be set. I found no configuration file for mc.
The setup saving logic is quite counter-intuitive.
The manual "Options > Save setup" seems to cover both
The "Options > Configuration... > Auto save setup", despite looking similar, only covers
ini by default. To make it cover
panels.ini as well, you have to turn on the separate option: "Options > Panel options... > Auto save panels setup".
Thus, after setting up your preferred panel listing formats, either use "Options > Save Setup" manually, or turn on BOTH automatic ones.