What does the 'mouse cursor in a box' button do?
When configuring touch controls on the Steam Link iOS app, there's a button in the bottom right of a white mouse cursor inside a box. Clicking it toggles whether the white mouse cursor is inside or outside the box.
What does this button of a mouse cursor inside a box do?
Solution 1:
According to the Steam Link Touch Controller Guide:
Hide Cursor at game launch
Pressing this will hide the cursor at the bottom-right corner of the screen. This is useful for when you are using gamepad controls to play a game but the game does not automatically hide the cursor.