I'd like to have 2 buttons, 1 where I can zoom in and 1 I can zoom out, if I hold down on them.
Or on a touch screen, how they can zoom in and out.
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use set layer scale or layer rate scale or layout scale or sprite scale.... depends of what you want to do...
https://www.scirra.com/manual/125/system-actions
https://www.scirra.com/manual/115/sprite