We can put individual apps on the Samsung device into standby (Sleeping apps), which means that they will no longer run in the background. So they will no longer be updated or send notifications until we call them up again.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Device care
Step 3:  Tap on  Battery
Step 4:  Tap on  App power management
Step 5:  Tap on  Sleeping apps
Step 6:  Tap on  Add apps
Step 7:  Choose all desired  apps
Step 8:  Confirm with  Add
  1. Open the Settings
  2. Tap on Device care
  3. Tap on Battery
  4. Tap on App power management
  5. Tap on Sleeping apps
  6. Tap on Add apps
  7. Choose all desired apps
  8. Confirm with Add

Samsung Instructions