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The latest documentation was moved to docs.qfield.org
The beautiful thing about GIS is that maps are dynamic. Layers can individually be shown and hidden and information can be presented more or less prominently based on the task at hand.
This is what Map Themes (before QGIS 3.0 known as Visibility Presets) are for.
Creare un tema da una mappa in QGIS è una operazione molto semplice.
Switching Map Themes is possible from the Dashboard.
Use the Map Themes combobox to chose the active theme.