Assign tasks to your team so that everyone is aware of what they must do and thus check if someone is over assigned or is free for more tasks.
In each activity, you may estimate how much time must be dedicated per person, with which you can visually analyze the time that each person has been assigned. You will know if someone is over assigned or has free time, to support with an activity of a coworker who is over assigned.
Additionally, when you assign a member of your team as responsible for a new activity of a new project, they may realize it in different ways:
By a notification.
By their pending items section.
By their calendar section.
Your work team may organize their day according to the activities that are pending.