Thank you for your post. Avenza Maps does not have a slide method for zooming in and out similar to Google. The functions that Avenza does have for zooming in are to pinch, or double tap. For zooming out, the options are to pinch the opposite way, or to two-finger single tap which will automatically revert back to the furthest zoom level. This latter option may be the quick solution that you are looking for. If you have any further questions or problems with the zoom function, please don’t hesitate to let us know!