Saving Documents in Other Formats
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Choose File - Save as. You will see the Save as dialog.
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In the Save as type or File type list box, select the desired format.
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Enter a name in the File name box and click Save.
If you want the file dialogs to offer another file format as default, select that format in Collabora Office - PreferencesTools - Options - Load/Save - General in the Default file format area.