I've noticed a bug in ko/pi 23. When you bring up the "Event Viewer" dialog **with a double-tap** it does not get the focus and the buttons on the bottom (Agenda, Edit, and Close) to not react to taps.
On some screens the tap gets handled by the window under the dialog. So, for example, bring it up over the month view, click Edit, and the month view screen creates a new event and brings up the Event Editor dialog to edit it (very confusing in this particluar case because you were expecting to edit the event being shown in the Event Viewer but the details are missing).
A work-around is to tap in the text area of the Event View dialog to give it the focus before tapping a button.
~ray