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;
FIG. 2 is another front view of the design of FIG. 1, showing the environment;
FIG. 3 is a front view of a second embodiment of the design; and,
FIG. 4 is another front view of the design of FIG. 3, showing the article in an alternate state of use.
The broken lines of the mobile terminal, text words, numbers and symbols are for the purpose of illustrating environmental structure and form no part of the claimed design. The dash-dot lines in the figures form a boundary of the claimed design, and form no part of the claimed design.