Example: This code work in extra.less

/* Sticky user cell - Start */
@media (min-width: {{ property('responsiveMedium') + 1 }}px )
    .message-cell.message-cell--user section .message-userArrow,
    .message-inner .message-userArrow {
        right: -(@xf-paddingLarge + 1);
    .message-user {
        position: -webkit-sticky;
        position: sticky;
        top: 40px;
/* Sticky user cell - END */


Pixel Exit Staff
Seeing as the CSS is that simple, I don't really see a need for an option. Thank you though for the suggestion.

I believe XF actually had some initial thoughts to make that area sticky in the beginning if I recall. I remember seeing some placeholder CSS for it!

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