The ornamental design for a displayscreen or portion thereof with graphical user interface, as shown and described.
FIG. 1 is a front view of a display screen or portion thereof with graphical user interface showing our new design; and,
FIG. 2 is a front view of the design of FIG. 1, shown in the context of a different environment.
The outer broken line rectangle showing of the display screen in FIG. 1 and the broken line rectangle and broken lines surrounding the rectangle showing of the display screen and device in FIG. 2 are included for the purpose of illustrating environmental structure and form no part of the claimed design. All other broken lines showing text and portions of the graphical user interface are included for the purpose of illustrating portions of the article and form no part of the claimed design.