When you are arranging objects on a page, turning on the [Enable Snap] feature will lead your image to snap onto the grid. Objects may be drawn or positioned on the grid. It can be useful when making fine arrangements of an object to disable [Enable Snap]. This will allow control without grid snap.
You can enable or disable this feature by toggling its icon on the ‘Arrange Tool’ bar:
indicates the functionality is enabled, and means it is disabled.