Align Vertical Centre
Vertically centres the selected objects. If only one object is selected in Draw or Impress, the centre of the object is aligned to the vertical centre of the page.
Choose .
From the tabbed interface:
Choose (text selected).
Select - deck.
To align the individual objects in a group, choose Format - Group - Enter Groupdouble-click to enter the group, select the objects, right-click, and then choose an alignment option.