The "Maximum Power Saving" mode is used on the Samsung device to save as much battery as possible to provide the longest possible battery life:

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  Power mode
Step 5:  Tap on  Maximum power saving
Step 6:  Tap on  Apply
  1. Open the Settings
  2. Tap on Device care
  3. Tap on Battery
  4. Tap on Power mode
  5. Tap on Maximum power saving
  6. Tap on Apply

Samsung Instructions
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