Display Screen or Portion Thereof with a Graphical User Interface

The patent file contains at least one drawing executed in color. Copies of this patent with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.

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

FIG. 2 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.

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.