In Zanshin I see:

https://i.imgur.com/L7k7s35.png

I don't know why I see in Projects and in Sources: Search>> "Accepted invitations" and Search>>"Open invitations". Why Source becomes a Project?

And why in each task I have in italic the name akonadi_ical_resource_2?

https://i.imgur.com/W9IviZB.png

I added akonadi_ical_resource_2. Is it default? Perhaps I deleted default and that is why I don't see it on a list:

https://i.imgur.com/yenZT2k.png

This is what I see in Korganizer:

https://i.imgur.com/CLuxx9a.png

I think it would be great if someone could create a video on how to set up and what is best practice to use all this programs and different resources.