Display Screen or Portion Thereof with a Graphical User Interface

This application is related to the following commonly owned co-pending patent applications: U.S. application Ser. No. 18/363,236, entitled “Keno Employing Mirrored Drawn Spots,” U.S. application Ser. No. 29/909,119, entitled “Display Screen or Portion Thereof with a Graphical User Interface,” and U.S. application Ser. No. 29/909,122, entitled “Display Screen Or Portion Thereof with a Graphical User Interface.”

FIG. 1 is a front view of a display screen or portion thereof with a graphical user interface of one embodiment of our new design; and,

FIG. 2 is a front view of a display screen or portion thereof with a graphical user interface of another embodiment of our new design.

The dashed broken line perimeter in the drawings illustrate a display screen or portion thereof and forms no part of the claimed design.