Snapping helps with precise placement of selection edges, cropping marquees, slices, shapes, and paths. However, if snapping prevents you from correctly placing elements, you can disable it.
Note:
To temporarily disable snapping while using the Move tool, hold down Ctrl.
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Deselects all Snap To options.
A check mark indicates that the option is selected and snapping is enabled.
Note:
If you want to enable snapping for only one option, make sure the Snap command is disabled, and then choose View > Snap To and choose an option. This automatically enables snapping for the selected option, and deselects all other Snap To options.