By default, the pattern input is visible on the lock screen of the Samsung device, which means that other people can also "read" the pattern, but to increase the security of the pattern, the pattern or input can also be made invisible.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Lock screen
Step 3:  Tap on  Secure lock settings
Step 4:  Enter your Lock screen  Password / PIN / Pattern
Step 5:  Enable or disable  Make pattern visible
  1. Open the Settings
  2. Tap on Lock screen
  3. Tap on Secure lock settings
  4. Enter your Lock screen Password/PIN/Pattern
  5. Enable or disable Make pattern visible

Samsung Instructions
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