Display Screen or Portion Thereof with Graphical User Interface

1. Display screen or portion thereof with graphical user interface

1 . 0 : Front

The ornamental design for a display screen or portion thereof with graphical user interface, as shown and described; the outer perimeter, illustrated in the figure by a pair of broken lines, illustrates a display screen or portion thereof and forms no part of the claimed design; the remaining broken lines in the drawings illustrate portions of the graphical user interface that form no part of the claimed design; the dot-dash broken lines define boundaries of the claimed design and form no part thereof; the figure is illustrated with gray scale shading to show contrasting appearance; no particular color is claimed.