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 my new design;
FIG. 2 is a front view of the display screen or portion thereof with graphical user interface of FIG. 1, in which a mobile terminal in broken lines is provided to illustrate an example environment; and,
FIG. 3 is a front view of a second embodiment of the display screen or portion thereof with graphical user interface, in which a mobile terminal in broken lines is provided to illustrate an example environment.
The broken line drawing of the mobile terminal, and the text/words, numbers, symbols, and otherwise images shown in broken lines in FIGS. 2 and 3 are for illustrative purposes only and form no part of the claimed design.