The button is called "Go back to the Wiki Administration" and the reason for calling that was that a way to access a template provider was from the Administration -> Content -> Page Templates -> visit/create a template provider.
Now, that's not the only way: another one is by using the "Ctrl + G" shortcut and directly access the page. In that case, the "Go back to the Wiki Administration" is a bit misplaced.
With the implementation of
XWIKI-16725, there will be another way to access a template provider and, again, the button might be confusing.
I suggest to rename the button to "See all templates".