Grids are in place to help you align and position shapes and text when you create documents in Creately.
You can show and hide the grid from the right-hand side toolbar for the canvas.
Make sure you have not selected anything on the canvas. If there is a current selection, de-select it by clicking on a blank space on the canvas.
On the right-hand toolbar, you can then see the snap to grid and show/hide grid options.
You can also toggle snap to grid behavior from this menu.
Snap to grid snaps at every 5px.