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In Explorer.xml, in the map section, it is possible to configure that no labels are displayed. Likewise, the Options>>>Explorer Options "map" tab can turn labels on and off.
showThresholdWarningIcons
This is by default false, but if it is set to true and the variable showWarningIcons in the FewsExplorer is not set, then the threshold icons in the data viewer are shown. So this is overriden by the user settings.
Zoom extents
The zoom extents is used to define the pre-configured zoom levels that can be selected from the main display.
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