There is a graphical toolbar in planner. The wider you
have the planner window, the more icons you see as 
graphical button in a single strip of "ribbon".
The rest of the items are put in a popup menu (single 
line  text entries) which you can bring up by clicking 
on the arrow button to the right of the ribbon.

The problem is that that toggle button doesn't have an
accessible name, so when you read it with a screen reader
like Orca, you have no idea that there is a menu of other
options available to you.

The accessible name for this component should be something
like "Display more options" or "Show Remaining Items".