1) Global Setting
To set a zoom level globally you need to use
Tools -> Option -> LibreOffice -> Advanced -> Button: Open Expert Configuration and Search for Zoom. Set
org.openoffice.Office.Writer - Zoom -> Property: Value, Type: long to value
- This also works for other modules. See dialog
- As @Hrbrgr already mentioned the zoom factor is stored within the document. So if you changed the zoom factor during edit and then saved the file, subsequent openings will use the documents zoom factor and override the global setting (at least in my test this happens).
2) Toolbar Setting
To put a special zoom level into a toolbar use
Tools -> Customize -> Tab: Toolbars and:
Target: Select the Toolbar were you want to appear the zoom level
and click the black right arrow (You may place to your preferred location using up and down arrows rightmost).
Finally click Ok button