Display Screen or Portion Thereof with a Graphical User Interface

FIG. 1 is a front view of a display screen or portion thereof with a graphical user interface of the claimed design;

FIG. 2 is a second front view thereof;

FIG. 3 is a third front view thereof;

FIG. 4 is a fourth front view thereof;

FIG. 5 is a front view of a display screen or portion thereof with a graphical user interface of the claimed design according to a second embodiment;

FIG. 6 is a second front view thereof;

FIG. 7 is a third front view thereof;

FIG. 8 is a fourth front view thereof;

FIG. 9 is a front view of a display screen or portion thereof with a graphical user interface of the claimed design according to a third embodiment;

FIG. 10 is a second front view thereof;

FIG. 11 is a third front view thereof;

FIG. 12 is a fourth front view thereof;

FIG. 13 is a front view of a display screen or portion thereof with a graphical user interface of the claimed design according to a fourth embodiment; and,

FIG. 14 is a second front view thereof.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1 - 4 , 5 - 8 , 9 - 12 , and 13 - 14 , respectively. The process or period in which one image transitions to another image forms no part of the claimed design. The bold dashed broken lines define the bounds of the claimed design and form no part thereof. The remaining dashed broken lines illustrate portions of the display screen or portion thereof with a graphical user interface that form no part of the claimed design.