Hello everyone, who, as myself, was looking for how the heck to keep those shaders enabled on game launch. I'm personally on Android, but as I understand the mystery ui of RetroArch, it should be cross-platform.
So: select your prefered shader in the Quick Menu, then "Save Preset" (yes, i thought it has to deal smtn with editing shader itself, but it is NOT (not entirely)) -> "Save Core Preset