The ornamental design for a displayscreen or portion thereof with graphical user interface, as shown and described.
1. Display screen or portion thereof with graphical user interface
1.1 : Front
1.2 : Back
1.3 : Left
1.4 : Right
1.5 : Top
1.6 : Bottom
1.7 : Partial enlarged front view, provided for clarity of illustration
The outermost broken lines showing an electronic device are included to illustrate environmental structure; the dashed broken lines inside the solid line display screen show portions of the graphical user interface; the top and bottom most horizontal dashed broken lines in reproduction 1.7 indicate the limits of the enlarged partial view; all broken lines form no part of the claimed design.