Display Screen or Portion Thereof with Graphical User Interface

FIG. 1 is a front view of a display screen or a portion thereof with a graphical user interface;

FIG. 2 is a front view of a display screen or a portion thereof with a graphical user interface showing the design of FIG. 1 in a differing broken-line context;

FIG. 3 is a front view of a second embodiment of a display screen or a portion thereof with a graphical user interface;

FIG. 4 is a front view of a third embodiment of a display screen or a portion thereof with a graphical user interface; and,

FIG. 5 is a front view of a fourth embodiment of a display screen or a portion thereof with a graphical user interface.

The outer broken-line rectangle shows a display screen or a portion thereof and forms no part of the claimed design. The remaining broken-lines show portions of a graphical user interface and form no part of the claimed design.