If the accessibility  settings are reset, all settings that affect the accessibility are reset to the default values. This includes, for example, the Voice Assistant, mono audio or improvements for visibility or hearing. The keyboard settings are not reset by this function.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  General management
Step 3:  Tap on  Reset
Step 4:  Tap on  Reset accessibility settings
Step 5:  Tap on  Reset settings
Step 6:  Confirm with  Reset
  1. Open the Settings
  2. Tap on General management
  3. Tap on Reset
  4. Tap on Reset accessibility settings
  5. Tap on Reset settings
  6. Confirm with Reset

Samsung Instructions