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Vertically centers the selected objects. If only one object is selected in Draw or Impress, the center of the object is aligned to the vertical center of the page.
Choose Format - Align - Centered (Collabora Office Writer, Collabora Office Calc).
Choose Shape - Align - Centered (objects selected) (Collabora Office Draw).
Open context menu - choose Align - Centered (objects selected) (Collabora Office Impress, Collabora Office Draw).
On Align bar (Collabora Office Impress, Collabora Office Draw), click
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