Once you create an Activity, its then needs to be approved depending upon if it is trusted child or non trusted child.
Any activity you create is a one-off activity, Once it is completed, it will disappear from the current view, and only be shown in history.
If you want to set up something recurring, like brushing your teeth at 7 pm each day you can click on the schedule on the activity by clicking Date to set it up to repeat every day, weekly, or Monthly.
The reason why we hide it is because we don’t want to have a huge massive list of built-up activities have been done over the weeks in months so we only show what is current i.e. what is due to be done still and what has been completed today.