There are really four basic adjustments.
1. Distance from wall behind speakers.
2. Distance of listening position from speakers (assuming this is adjustable).
3. Distance from side walls (corollary: distance between speakers).
4. Toe-in.
Whenever you make a change to 1, 2, or 3, you need to adjust 4 to keep it the same angle, but in addition if you change 1, 2, or 3, a different toe-in may prove to be optimal.