Declined Events are hidden in the calendar on the Samsung device by default, but if you want to show such events, you need to disable the "Hide declined events" option in the settings.

Android 10 (One UI 2.0)
Step 1:  Open the  Calendar -App
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Enable or disable  Hide declinded events
  1. Open the Calendar-App
  2. Open the menu
  3. Open the Settings
  4. Enable or disable Hide declinded events

Samsung Instructions
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