This study found that changing your foot position on a leg press can influence muscle activation. Placing your feet lower on the sled will emphasize quads more while placing your feet higher on the sled will activate glutes more. Use both placements in your training to maximize lower body gains!
Source: Da Silva, E. M., Brentano, M. A., Cadore, E. L., De Almeida, A. P. V., & Kruel, L. F. M. (2008). Analysis of muscle activation during different leg press exercises at submaximum effort levels. The Journal of Strength & Conditioning Research, 22(4), 1059-1065.