Is it possible to edit the transaction code through the Editor in Studio 11?
This was possible with 10.x as described in How to Change the transaction code used in a Read from SAP script
Studio 11 and Transaction 10X
This is not supported in Studio 11; Editor facility has been removed from the Studio 11 solely because of the user can perform the wrong changes as well and due to this script can get corrupted.
However the workaround will be to open the Studio 11 file in 10.X make the changes in Editor and then reopen the script in Studio 11.