the "secure folder" can be hidden/hidden on the start screen as well as on the app screen. while the folder is hidden, it can't be opened either. the only way to make it visible again is via the usual settings themselves. to make a change, the password/PIN/pattern for the "secure folder" must be present.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Biometrics and security
Step 3:  Tap on  Secure Folder
Step 4:  Enable or disable  Show icon on Apps screen
Step 5:  Confirm with  Hide
  1. Open the Settings
  2. Tap on Biometrics and security
  3. Tap on Secure Folder
  4. Enable or disable Show icon on Apps screen
  5. Confirm with Hide

Samsung Instructions
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