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When you enter a place-name or a keyword in the search box, you see suggestions as you type. If you see an arrow in the search box, you can search on all sources, or click the arrow and choose a layer from the drop-down list.
If you organisation has enabled it, there may also be check-boxes available next to the searches in the drop-down. But ticking these on or off you will filter down what results are returned.
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