"Source" field (subordinate) assigned to "Definition" field is not visible in MultiTerm but can be seen and filled in in quickTerm

"Source" field (subordinate) assigned to "Definition" field is not visible in MultiTerm but can be seen and filled in in quickTerm - despite using the "Full Layout"
The "Source" field is both used at Entry Level and at Term Level.

It is part of both the Termbase Definition and the Entry model....

What went wrong?