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 a graphical user interface showing a first embodiment of my new design.
FIG. 2 is a front view of a display screen or portion thereof with graphical user interface showing a second embodiment of my new design.
FIG. 3 is a front view of an electronic device having a display screen graphical user interface showing a third embodiment of my new design.
The outermost broken-line rectangle in FIGS. 1 and 2 illustrates a display screen or portion thereof. The broken lines within this rectangle illustrate portions of a graphical user interface. The broken-line square in FIG. 3 illustrates a perimeter of the display screen of an electronic device. The broken lines outside this perimeter illustrate portions of the electronic device, whereas the broken lines within the perimeter illustrate portions of a graphical user interface. The broken lines form no part of the claimed design.