@Scott_Collier-Weir, if you create the Full View Row URL using this formula :
Concatenate(thisRow.Url().ToText(),"&view=full")
or this one
Format("{1}{2}",thisRow.Url(),"&view=full").ToText()
The Full view opens in the same page instead of a new tab 
… for some reasons 
…
(See the buttons Open 2 and Open 3 and the columns URL 2 and URL 3 in the copy I’ve made from your sample below 
)
Just in case : An editable version of this doc is available here 
Copy of OpenRow Fullscreen - Edit