If you drag the reminder row to the left (only when in non-edit mode), two buttons appear on the right. The "More" button also shows this popup. So, the popup

If you drag the reminder row to the left (only when in non-edit mode), two buttons appear on the right. The "More" button also shows this popup. So, the popup is shown by clicking on a bright blue "i" in a circle or a square dark grey "More" button, and the title of the popup is "Details"... Also, if you type and press enter too quickly, you can make the app crash.