We claim the ornamental design for a display screen or portion thereof with graphical user interface, as shown and described.
The sole FIGURE is a front view of a display screen or portion thereof with graphical user interface showing our new design.
The outermost evenly spaced broken line illustrates the display screen or portion thereof and form no part of the claimed design. The inner evenly spaced broken line at the perimeter of the figure and the remainder of the broken lines in the figure illustrate portions of the graphical user interface and form no part of the claimed design. The dot-dash lines in the figure illustrate a boundary of the claimed design, and form no part thereof.