Search: the Search button, or the / key. You search titles, labels and names.
Phase and filters: choose My cards, Overdue or Without owner, and hide empty swimlanes. On My tasks there is only Overdue, because those are all your cards.
Zooming: Ctrl with scrolling; on a phone with two fingers.
Column width: drag the edge of a column header.
As calendar: shows the tasks of this board in the calendar.
The menu: here you rename, refresh the board, find it in Files, put it on a whiteboard and delete it.