I claim the ornamental design for a display screen 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 according to the first embodiment;
FIG. 2 is a front view of a display screen or portion thereof with graphical user interface showing my new design according to the second embodiment; and,
FIG. 3 is a front view of a display screen or portion thereof with graphical user interface showing my new design according to the third embodiment.
The outermost broken line showing of the display screen or portion thereof is for environmental purposes only and forms no part of the claimed design.
The remaining broken lines in the figures depict portions of the graphical user interface which form no part of the claimed design.