Help:Show preview
From Indonesia Elevator Guide
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It's a good idea to use the "Show preview" button to see what your change will look like before you save it. This is also related to tracking changes because every time you save, this is displayed to others as a separate change. This isn't something to worry about too much, but it's good to get into the habit of eliminating mistakes in your own work by using a preview before saving, rather than saving several minor corrections afterwards.