Figure Universe™ Pro Haley Stegman says, "No shoes no problem. Assess your leg day without shoes, or go with flat shoes. Use your heels to push away from the floor (or in this case leg press) & find an overall balance in your foot placement."
"Too often I see toes doing a little dance & heels elevating during heavy compound lifts. That’s a no-no. Don’t be lifting those feetsies off the floor during these movements folks. Strengthen your muscles including those in your feet & work toward improving your overall stability and balance. (As I mentioned, flat shoes work great if your feet stank.)"