You need to adjust the "Placement" properties of the additional labels. Note, if you select the node, the "Placement" property in the "Label" section refers to the first label only.
To adjust the placement of the second (third) label, select the second (third) label either by pressing and holding CTRL while (repeatedly) left-clicking on the label or by using "Tool" -> "Select Elements" and drag the label to the desired position with the mouse, or choose a "Placement" like "Sandwich: North"/"Sandwich: South", or use an "Internal" placement with appropriate "Distance" values. E.g. the following label selection
(corresponding GraphML) may be achieved using "Select Elements" with the following settings