The ornamental design for a displayscreen or portion thereof with icon, as shown and described.
FIG. 1 is a front view of a display screen or portion thereof with icon showing our new design according to a first embodiment;
FIG. 2 is a front view of a display screen or portion thereof with icon showing our new design according to a second embodiment;
FIG. 3 is a front view of a display screen or portion thereof with icon showing our new design according to a third embodiment;
FIG. 4 is another front view of the first embodiment, shown with a different environment;
FIG. 5 is another front view of the second embodiment, shown with a different environment; and,
FIG. 6 is another front view of the third embodiment, shown with a different environment.
The outer perimeter, illustrated by a pair of broken lines in FIGS. 1-3 and by broken lines in FIGS. 4-6, represents a display screen or portion thereof and forms no part of the claimed design.