In the notification settings there are 4 sub screens for EVENTS, TASKS, BIRTHDAYS and STICKY DATE:
Events
You can configure the ringtone for events, as well as vibration and LED.
For Android 8+ you can also go to the Android notification channel settings.
You can set the default snooze duration which events will be snoozed for, when you press SNOOZE on the notification.
You can configure automatic re-notification, e.g. to re-notify 3 times in 15 minute intervals (unless the notifications is dismissed by the user).
To configure the default notifications for new timed and all-day events, please go to Event defaults and Editor settings.
To mute single calendars, go to the calendar list (MENU - manage calendars).
Birthday and anniversaries
You can configure ringtone and time, as well as vibration and LED.
For Android 8+ you can also go to the Android notification channel settings.
Additionally, you can set how many days in advance (multiple options split by favorites and all contacts) you will be notified.
Tasks
You can configure ringtone and time (for all day notifications), as well vibration and LED.
For Android 8+ you can also go to the Android notification channel settings.
Sticky Date (NEW in aCalendar 2.2)
The sticky date notification shows upcoming events as sticky notification with the current date as notification icon.
You can configure the profile for displaying the agenda,
Showing tomorrow's events and event locations are optional.
Wake up screen
This settings lets you configure if your device should turn on the display when notifications are shown while the device is sleeping. This lets you easily see the notification details at the cost of a little battery power.
TEST and DEBUG
The TEST button, creates a test notification and performs several checks for common setup issues that interfere with notifications.
After pressing TEST you can also press DEBUG to see all scheduled and dismissed events in the Android alerts database (customer support may asks you to do this when there are problems with notifications)
The insistent option was removed by Google for Android 8 which now is mandatory for all new and updated apps. We offer a configurable re-notify feature as replacement.
For further info please also see notifications.