Display Screen or Portion Thereof with a Graphical User Interface

FIG. 1 is a front view of a display screen or a portion thereof, with a graphical user interface showing a first image our new design.

FIG. 2 is a front view of a display screen or a portion thereof, with a graphical user interface, showing a second image of our new design.

FIG. 3 is a front view of a display screen or a portion thereof, with a graphical user interface showing a third image of our new design.

FIG. 4 is a front view of a display screen or a portion thereof, with a graphical user interface showing a fourth image of our new design.

FIG. 5 is a front view of a display screen or a portion thereof, with a graphical user interface showing a fifth image of our new design.

FIG. 6 is a front view of a display screen or a portion thereof, with a graphical user interface showing a sixth image of our new design.

FIG. 7 is a front view of a display screen or a portion thereof, with a graphical user showing a seventh image of our new design; and,

FIG. 8 is a front view of a display screen or a portion thereof, with a graphical user interface showing an eighth image of our new design.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1 - 8 . The process or period in which one image transitions to another image forms no part of the claimed design. Shading forms no part of the claimed design. The “X” elements and three-dot icons form no part of the claimed design.

The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines showing the outer border of the display screen or portion thereof and the interior features of the graphical user interface in the drawings forms no part of the claimed design.