To display two or more bible versions in columns:

• Select the versions you wish to see
• Click on the options 'cog' and select "Column view"  

This is partilarly useful when you want to see two versions of the same passage, because the verses will always remain aligned. Bibles and Commentaries can be viewed together. 

You can add as many versions as you wish, though the columns will become narrower with each. 
You can reduce the display to a single panel to give room for more columns.