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, showing our new design, oriented in portrait.

FIG. 2 is an annotated front view thereof.

FIG. 3 is an enlarged partial front view thereof, shown as indicated by “A” in FIG. 2 for clarity of illustration.

FIG. 4 is a front view shown in an alternate environment, oriented in landscape.

FIG. 5 is an annotated front view shown in the alternate environment, oriented in landscape.

FIG. 6 is an enlarged partial front view, shown as indicated by “B” in FIG. 5 for clarity of illustration.

FIG. 7 is a front view of a display screen or portion thereof with a graphical user interface, showing our new design, oriented in portrait according to a second embodiment thereof.

FIG. 8 is an annotated front view thereof.

FIG. 9 is an enlarged partial front view thereof, shown as indicated by “C” in FIG. 8 for clarity of illustration.

FIG. 10 is a front view shown in an alternate environment, oriented in landscape.

FIG. 11 is an annotated front view shown in the alternate environment, oriented in landscape; and,

FIG. 12 is an enlarged partial front view, shown as indicated by “D” in FIG. 11 for clarity of illustration.

The broken line showing of the display screen and remainder of the graphical user interface forms no part of the claimed design.