Wide stance, toes out, glutes on fire.
Push your knees out in line with your toes, don't let them cave inward.
Taking a wide stance with toes out changes the squat's geometry, the quads still drive knee extension through the deep range, while the glutes get extra recruitment from the turned-out, knees-tracking-wide position. The bar on your back lets you load the pattern properly, which is what separates this from bodyweight sumo variations. It earns its place for lifters who want squat volume that hits the inside of the wide stance and glutes harder than their standard stance does.
The wide, toes-out stance biases the glutes and the inner thigh region while the quads keep doing quad things. Most lifters use it as a second squat variation to attack the legs from a different angle, not as a replacement for their main squat.
Drop the weight and drive your knees out over your toes the whole rep, especially out of the bottom. If they still cave, your stance may be wider than your hips can control yet. Narrow it slightly and build back out.
Thighs to parallel is the working standard. The wide stance limits depth compared with a narrow squat for many hips, so chase a solid parallel position with an upright chest rather than forcing extra depth that tucks your pelvis.
