Choose what you need. Hide at start: the layer is hidden when the page opens, but respondents can turn it on from the layer menu. Hide from menu: the layer is always visible but not listed in the layer menu.
Hide at start
- Add the map layer to the page in Map and layout.
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Click the three dots next to its name. Tick Hide by default.
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Now respondents won't see this map layer when they first access the survey, but can make it appear by selecting it from the legend.
Hide from menu
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Open Edit legend.
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Untick Visible in legend. Remember to Save!