Add multiple or change Calendars in the To-Do Bar

I’ve configured multiple email accounts in Outlook and several of them have a Calendar of their own. I’ve also created a few additional Calendars of my own to separate between the type of appointments I have (work, private, sport club, my kid’s school schedule, etc…).

Within the Calendar Navigation, I can easily get an overview of all my appointments by using the Calendar Overlay feature.

However, the To-Do Bar only lists the appointments of the Calendar from one of my accounts.

Is there any way that I can add additional Calendars to the To-Do Bar or switch between them somehow?