The ornamental design for a displayscreen or portion thereof with graphical user interface, as shown and described.
FIG. 1 depicts a first image in a sequence for a display screen or portion thereof with graphical user interface; and,
FIG. 2 depicts a second image in a sequence for a display screen or portion thereof with graphical user interface.
The outermost broken-line rectangle illustrates the perimeter of a display screen or portion thereof and forms no part of the claimed design. The remaining broken lines illustrate portions of a graphical user interface and form no part of the claimed design.
The appearance of the transitional images sequentially transitions between the images shown in FIGS. 1-2. The process or period in which one image transitions to another forms no part of the claimed design.