What does this icon in iOS Stardew Valley mean?

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Wondering if anyone knows what this icon means in top left hand side of screen. I can press it but don’t know what it actually does. This is on IOS version.


Solution 1:

As mentioned in the wiki, it's a toggle button for the controls:

  • When the toggle button is on, the control method is set to whatever method has been selected from the drop down.
  • When the toggle button is off, the controls switch to Tap-to-move & Auto-Attack.