Quickly Find The Center of Any Document
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Your choices stick across every tutorial on this device.
In order to quickly find the center of any open document, set the rulers to percentage, then look for the 50% point, that will be the center.
You can set the rulers to percentage by right-clicking on the rulers and choosing Percentage. If the rulers are not visible press Ctrl + R (Mac: Command + R) on the keyboard to show (or hide) them.