On Align bar (LibreOffice Impress, LibreOffice Draw), click
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The vertical position of the selected objects is not affected by this command.
To align the individual objects in a group, choose Format - Group - Enter Group to enter the group, select the objects, right-click, and then choose an alignment option.
To align the individual objects in a group, double-click to enter the group, select the objects, right-click, and then choose an alignment option.