Retarget manager missing scroll bar

REGRESSION: Yes, does not occur in 4.15

In the Retarget Manager, the scrollbar for the Set up Rig section is missing.

1. Open QAGame in editor.
2. Open UE4_Mannequin_Skeleton.
3. Open the Retarget Manager.

RESULT

There is no scrollbar in the Set up Rig section.

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Bonjour j'ai un petit problème c'est que je ne vois plus l'onglet "scability" pour changer les graphismes de uefn et j'ai pas trouvé l'option pour le faire revenir ?