Disable click-to-select in render view
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
In Render View, we have support click-to-select a data source for a while. However no one seems to use it and it only causes confusion with people thinking why it suddenly takes a while when one clicks. Also, it changes the active source without the user realizing it -- another source of confusion.
We should just disable it.