In the Samsung calendar we can display alternative calendars in addition to the standard one, including

The alternative calendars are displayed in a reduced size in the usual calendar.


Android 10 (One UI 2.0)
Step 1:  Open the  Calendar -App
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Alternate calendar
Step 5:  Choose diresir  calendar
  1. Open the Calendar-App
  2. Open the menu
  3. Open the Settings
  4. Tap on Alternate calendar
  5. Choose diresir calendar

Samsung Instructions