FIG. 1 is a front view of a first embodiment of a display screen or portion thereof having a graphical user interface;
FIG. 2 is a front view of a second embodiment of a display screen or portion thereof having a graphical user interface; and,
FIG. 3 is a front view of a third embodiment of a display screen or portion thereof having a graphical user interface.
The dot-dashed broken lines depict a boundary of the display screen or portion thereof or a boundary on the display screen and form no part of the claimed design. The dashed broken lines depict portions of the display screen or portion thereof having a graphical user interface which form no part of the claimed design.