Metadata can be edited using keyboard shortcuts:

  • Add (Insert): CTRL + I

    • adding a new Layer

  • Edit: CTRL + E

    • start editing

  • Save: CTRL + S

    • save your edits

  • Paging: ALT + arrow left / arrow right

    • open the next or the previous item

On Apple devices use Apple Key instead of CTRL.

In Safari use the Option Tab to tab to the calendar icon and open it with Enter or tab to the add buttons.

https://www.youtube.com/watch?v=S5I7IWyqy84&t=8s