The VocAlign plugin window shows only one track of the Dub capture. However, you can Control-click in the Dub track to open a dropdown menu and select the desired Dub among the ones you captured, as shown in the image below:
If you set up Logic Pro so your track selection follows your region/marquee selection, when you select a region that you captured as a Dub, VocALign will display it in its Dub track. To do this, enable "Select tracks on Region/Marquee selection" in Logic Pro's Preferences, in General > Editing: