I have been taught this, and it seems to work pretty well:
If you want to turn right (for example) then you apply pressure with your left leg and also apply a little pressure with the right rein.
Horses move away from pressure - so I have always applied pressure from my outside leg and my horses seem to respond pretty well.
To me, when you add pressure with your inside leg - and it being back a little - and apply pressure with your inside rein at the same time, then to me I would be asking my horses to sidepass.
🔫 Don't Tread On Me 🐍