In iOS, you should create custom Views to re-use functionality on multiple screens.
When using icons, use the search function of your IDE to check all instances. The icon should have the same accessibility label on each screen, and the functionality should also be the same.
For example, when using a cross icon for closing a screen, make sure the label is 'Close' on all screens, and check that it always closes a screen.
In Xcode you can use the shortcut Cmd + Shift + F on Mac, or Ctrl + Shift + F on Window to open the global Find function.
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