With Chrome on Android, using a Nexus 5X and a Galaxy Tab S, nextcloud 15.0.8:
When I add a calendar event, a small pop-up opens. To add attendees I click on “more”. The sidebar for the calendar event opens on the right-hand side. I can add attendees but the blue “add/update” button is outside the visible area and it is not possible to scroll to it.
For existing events I can also access “remove”, “cancel” and “export”.
Works on Windows Chrome.
Anyone else seeing this?