How do I choose what data is displayed in Agenda online?

In Agenda Online you can select the columns to display in the overview.
In the top menu Main, select Columns/Group and start typing what you are looking for:

Or check the items to display in the overview.

If you want to rearrange the order of the columns, you can drag them directly in the list:

or move columns.

How do I save a prepared view - how do I select it again?