The ornamental design for a displayscreen or portion thereof with graphical user interface, as shown and described.
FIG. 1 is a front view of the design of FIG. 2 shown within a broken line environment of use in an electronic device housing forming no part of the claimed design; and,
FIG. 2 is a front view of a display screen or portion thereof with graphical user interface.
The broken line electronic device housing is included for the purpose of illustrating environmental structure; the remaining broken line portions of the graphical user interface are included to show portions of the article; all broken lines form no part of the claimed design.