You have enabled the Company setting "Show the Actions Menu on the Top Right in Fiori Client".
However, when you check the Calendar workcenter, the menu still remains at the bottom of the screen.
SAP Cloud For Customer
Calendar is a custom control and the footer is not created in the framework. So the changes for action items on top will not affect the Calendar workcenter.
This is the expected behavior of the system. This setting only applies to the homepage, list view and detail view.
Calendar, Add, Button, TI, OIF, Fiori, 1908 , KBA , AP-RC-MOB-UIF , Responsive UI , Product Enhancement