Display Screen or Portion Thereof with Graphical User Interface

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

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

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

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

The dot-dash-dot broken lines illustrate a display screen, which is the environment of the design, and which forms no part of the claimed design. The remaining broken lines illustrate portions of the graphical user interface, and form no part of the claimed design.