We can activate the wizard menu or the menu for user assistance on the OnePlus smartphone by means of an additional button in the navigation bar.

The following functions are available in a larger view:

In addition, the view for large buttons can be activated in the options to facilitate the use of the smartphone.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Settings
Step 2:  Tap on  System
Step 3:  Tap on  Accessibility
Step 4:  Tap on  Accessibility Menu
Step 5:  Enable or disable  Accessibility Menu
Step 6:  Tap on  Allow
Step 7:  Confirm with  Got it
  1. Open the Settings
  2. Tap on System
  3. Tap on Accessibility
  4. Tap on Accessibility Menu
  5. Enable or disable Accessibility Menu
  6. Tap on Allow
  7. Confirm with Got it

OnePlus Instructions