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. 18/748,834, entitled “Selective Tile Accumulation Sequences and Related Selective Accumulated Tile Use Sequences,”; U.S. application Ser. No. 18/748,907, entitled “Selective Tile Accumulation Sequences and Related Selective Accumulated Tile Use Sequences with Bypass Features,”; U.S. application Ser. No. 18/748,960, entitled “Hand and/or Run Selection Sequences for Selective Tile Accumulation Sequences and Related Selective Accumulated Tile Use Sequences,”; U.S. application Ser. No. 18/748,985, entitled: “Selective Dice Type Tile Accumulation Sequences and Related Selective Accumulated Dice Type Tile Use Sequences,”; and U.S. Application ser. No. 29/948,336, entitled: “Display Screen or Portion Thereof with a Graphical User Interface,”.

FIG. 1 is a front view of a display screen or a portion thereof with a graphical user interface showing a first embodiment of our new design.

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

FIG. 3 is a front view of a display screen or a portion thereof with a graphical user interface showing a third embodiment of our new design.

FIG. 4 is a front view of a display screen or a portion thereof with a graphical user interface showing a fourth embodiment of our new design.

FIG. 5 is a front view of a display screen or a portion thereof with a graphical user interface showing a fifth embodiment of our new design.

FIG. 6 is a front view of a display screen or a portion thereof with a graphical user interface showing a sixth embodiment of our new design.

FIG. 7 is a front view of a display screen or a portion thereof with a graphical user interface showing a seventh embodiment of our new design; and,

FIG. 8 is a front view of a display screen or a portion thereof with a graphical user interface showing an eighth embodiment of our new design.

The outer perimeter broken lines in the drawing show a display screen or a portion thereof and forms no part of the claimed design.