By clicking the "to be approved" button, You get a moveable popup box.
The "box" can be moved by left-mouse-down-hold, and then place it where You like.
When hovering over the upper-right X it becomes red. If You click on it, the window closes again.
In top is shown a date interval.
This date interval is depending on the settings, in combination with the date in the date-picker field.
When clicking on an event in the list, the eventwindow opens, and You can approve and then save the event.
In the calendar view, the red mark in the event is now removed, and when clicking a new "to be approved" list to pop up, the newly approved event, is no longer on the list.