User Configuration > Administrative Templates > Microsoft Publisher 2016 > Publisher Options > Advanced > Complex scripts
User
HKCU\software\policies\microsoft\office\16.0\publisher\preferences
This policy setting allows you to set the default text flow between Right-to-Left (RTL) and Left-to-Right (LTR). If you enable this policy setting, you may choose whether text will flow RTL or LTR. If you disable or not configure this policy setting, the default text flow setting is used.