Jira shows the full size pictures as a modal popup when clicked.
Zephyr Scale should do the same, it would be more intuitive / homogeneous, and practical because the screenshots are often unreadable as they are (see screenshot).
Workaround by right clicking / opening picture is less straightforward.
|I would like...||to see full size pictures when left-clicked|
|So that I...||get the information a bit more intuitively and quickly|