Declined events for meetings, for example, are hidden by default in the calendar app of the OnePlus smartphone.

However, to get an overview of past and rejected events, we can turn on/off to display them manually at any time.

Android 10 | OxygenOS 10.0
Declined events -  Open the  Calendar app
Declined events -  Open the  menu
Declined events -  Open the  Settings
Declined events -  Tap on  General
Declined events -  Enable or disable  Show declined events
  1. Open the Calendar app
  2. Open the menu
  3. Open the Settings
  4. Tap on General
  5. Enable or disable Show declined events

OnePlus Instructions