Display screen or portion thereof with generated image

FIG. 1 is a front view of a display screen or portion thereof with generated image, showing my new design;

FIG. 2 is an enlarged view of a portion of the claim taken from line 2 - 2 in FIG. 1 ;

FIG. 3 is a front view of a second embodiment of FIG. 1 ; and,

FIG. 4 is a front view of a third embodiment of FIG. 1 .

The dash-dash broken line immediately adjacent and connecting the horizontal solid-line portions of the design represents an unclaimed boundary of the design. The broken line drawing of the device, symbol and otherwise images shown in broken lines in the generated image of FIGS. 1 through 3 are for illustrative purposes only and form no part of the claimed design. The size, scale, and location of the generated image of FIGS. 1 through 3 are for illustrative purposes and forms no part of the claimed design.