Hello @Jethro !

You may change thr max-width parameter's value for the CSS class div.bx-tl-view div.bx-tl-item-attachments div.bx-tl-item-attachment img in your template's custom styles area like:

.div.bx-tl-view div.bx-tl-item-attachments div.bx-tl-item-attachment img {

max-width: 85%;

}