I believe this situation might already be known to you.
When opening a message, the window shifts to the right, ending up underneath the “Selection info”.
The message opens at the viewpoint it was created - the utility of this makes sense when following a link to a specific message
That it underlays the properties may be something we can address more easily.
Issue tracked here (internal) WEB-2220 - Comment thread pane displays underneath the Selection Info pane
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