A search of the records in Family Search can be global (across all data sets) or by location (restricted to places where your ancestors lived).
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On the right side of the page, you can select a geographical region in which to search.
Hover your mouse over the world map until you see the correct region "light up" and then click to see a more detailed menu of options.
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You then have the choice of carrying out a search across all the records available for the area (see the left hand image below) or scrolling further down to where you can select one or more datasets from the list or (sometimes) make your choice of location even more precise.