2 close relatives of mine, both age 10, play for different (small, grassroots, FA affiliated) football clubs.
In one club children can be dropped off for training and games. Parents are welcome but staying is optional, and certainly during training most don't.
In the other, children must have an adult onsite at all times, training and games. Doesn't have to be a parent, and adults can 'share' so an adult could be responsible for a number of children, but it is emphasised everywhere that this is NOT a drop off club.
If it is relevant, fees for both are the same.
I don't know which one is 'normal' or 'correct'. The FA website doesn't specify either way as far as I can tell.
What is the experience round you?