Please try exempting aCalendar and your launcher (eg. Nova Launcher) from power optimization.
Tue, 3 Jan, 2023 at 8:27 PM
If you see no widgets offered, please make sure you didn't move aCalendar to your SD card. Also some launchers place aCalendar after capital letters A-Z.
Tue, 8 Jan, 2019 at 3:34 PM