Select the main menu icon (three stacked segments) on top right (Classic Version) or left (Suite, and apps), then select "Download as...".
A context menu opens, allowing you to choose the format of the saved file.
Select ".ggb file" if you want a fully functional copy of your activity.
GeoGebra assigns a default name to your saved file, you can change it and select the folder in which it will be saved using the displayed File Explorer window.
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