Display screen or portion thereof with a graphical user interface

FIG. 1 is an annotated front view of a display screen or portion thereof with a graphical user interface, showing my new design, according to a first embodiment thereof, the annotation being a long-dashed line, a leader line, and numeral “ 2 .”

FIG. 2 is an enlarged front view of the annotated portion of FIG. 1 .

FIG. 3 is an annotated front view of a display screen or portion thereof with a graphical user interface, showing my new design, according to a second embodiment thereof, the annotation being a long-dashed line, a leader line, and numeral “ 4 .”

FIG. 4 is an enlarged front view of the annotated portion of FIG. 3 .

FIG. 5 is an annotated front view of a display screen or portion thereof with a graphical user interface, showing my new design, according to a third embodiment thereof, the annotation being a long-dashed line, a leader line, and numeral “ 6 .”

FIG. 6 is an enlarged front view of the annotated portion of FIG. 5 .

FIG. 7 is an annotated front view of a display screen or portion thereof with a graphical user interface, showing my new design, according to a fourth embodiment thereof, the annotation being a long-dashed line, a leader line, and numeral “ 8 .”; and,

FIG. 8 is an enlarged front view of the annotated portion of FIG. 7 .

The outermost broken lines illustrate the display screen and form no part of the claimed design. The long-dashed boundary lines illustrate the periphery of the enlarged drawing views and form no part of the claimed design.