It's getting harder as my "stash" is building up. One thing I've started doing is labelling the back of my pedals with a little thermal print label of what the pedal is.
Since I "play" and "record" sitting at my desk in front of two 32" computer screens, if I'm using a particular pedal I'll pull up the build doc to remind myself what the knobs do. But tbh, a few minutes fiddling with any of the knobs I can usually find the sound I'm looking for.
Having said that, I've been trying my "top secret experiment" with a couple of pedals. Namely, painting the enclosures with rattle cans. I've had some limited success. (And I few failures) If I can get to the point of finding a clear top coat I like, I may start dipping my toes in the water with some knob labels.