Update user.md

Tecno lock

_vendors-content/tecno/user.md

@@ -11,3 +11,9 @@ Go to _Settings → Battery Lab → Battery Saving Settings → Disable **Power
 ## Allow app to run in the background
 
 Go to _Phone Master → Toolbox → Auto-start management → **Allow app to run in background**_
+
+## Lock the app in the Recent apps
+
+Head to recent apps with the navigation bar or using gestures press the down arrow on the top of microg.
+
+Press the first option with the 🔒 icon.