The Recent texts list allows you to return quickly to a passage in the Passage lookup¹ panel:  

• The Recent texts list appears between the panels in Two Panel² view. 
• Clicking the right arrow displays the passage in the right hand panel.
• Clicking the left arrow displays the passage in the left hand panel.
• Clicking on a Recent text displays that passage in the Passage lookup panel without otherwise affecting the current bibles displayed.
• To return to the previous panel use the return arrow on your browser.  

¹Clicking a bookmark or recent text always displays a Passage lookup panel, regardless of what was currently displayed in the panel. 

² The right hand panel isn't shown in the example.