When multiple data files are loaded, it is not clear which one will be optimized to

[blakecaldwell]

This is a problem because it is not currently possible to remove a specific data file.

[blakecaldwell]

More involved because functionality needs to be added to select the data files displayed. It should be possible to add/remove data files at a granular layer. That same functionality can be leveraged with a drop-down menu in the configuration optimization dialog.