Currently the message system displays scroll bars on both the conversation selector and the message itself even if there is no overflow or need for them. Attached is a screen shot showing what I mean.

This is a really easy fix. In the file:
components/com_easysocial/themes/wireframe/styles/style.min.css

simply change change scroll to auto in the following selector:

#es .es-convo__sidebar-scroll-area, #es .es-convo__content-scroll-area {

    overflow-y: scroll;

}

Auto basically determines if overflow should be used or not. If no overflow, it does not display a scroll bar which makes for a better UX.