Display screen or portion thereof having a graphical user interface

A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever.

The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.

The FIGURE is a front view of a display screen or portion thereof having a graphical user interface, showing the new design.

The dot-dashed broken lines depict boundaries of the display screen or portion thereof and form no part of the claimed design. The dashed broken lines depict the device, portions of the display screen or portion thereof, and portions of the graphical user interface that form no part of the claimed design.