In version 12.1, clicking Open File in Editor would bring:
On the left side a Tree View of Favorites and other File Folders, in the middle - list of files in the selected folder, and on the right side, a Preview Pane of the selected file contents.
Since upgrading, the 'Open File' dialog has reverted to the old style window.
How can it be changed back to the new style?
RESOLUTION:
In Toad for Oracle 12.1 to 12.6:
Go to View | Toad Options | Online | Script Repository | select 'Toad World' | Apply | OK.
In Toad for Oracle 12.7 and higher:
The script repository has been completely removed and the treeview UI was also removed. Request an enhancement request to add a similar UI in a future release of Toad for Oracle by clicking here.