It takes practice to figure out the portions and combinations that satisfy. I think when we first stop tracking, the tendency is to still be very conservative with how much we eat at one time. That makes our meals pretty small and snacks necessary, which is far better than going hungry. Eventually you can try combining what you would have eaten as a snack with one of the meals on either side of it and see if that allows you to go longer not being hungry or thinking about food. Eliminating snacks is definitely not a willpower issue where you ignore hunger and anxiety between meals. It's a matter of making meals big and satisfying enough that you genuinely don't get hungry or think about food for several hours.