Those arrows allow your people to scroll through your event listing in some way.
Check the chart below to find out how those arrows got there. Then, you will know how to remove them if you wish.
Your calendar view is.... | You toggled on... |
(1) Full (monthly) calendar (2) Events List (3) Cards (List) (4) Cards Grid | Design - Headers and Links - Header - Show month navigation |
Weekly view | Design - Events - Number of events - Show all events (back and forward arrows) or Show only upcoming events (just a forward arrow) |
(1) Events list (2) Cards (List) | Design - Events - Number of events - Show [#] upcoming events AND you toggled on Show event page scroll |