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The Samsung device's side panel can be opened by default using the black bar (arrow) at the edge of the screen, but if you don't like the black or the size of the panel, you can adjust it in this respect and in transparency.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Display
Step 3: Tap on  Edge panels
Step 4: Tap on  Handle
Step 5: Set a  Color ,  Transparency  or  Size
  1. Tap on Settings
  2. Tap on Display
  3. Tap on Edge panels
  4. Tap on Handle
  5. Set a Color, Transparency or Size
Download instructions?
If you need the manual often or offline, you can download it here as a PDF document for free. Download

Samsung Instructions