User Configuration > Administrative Templates > Microsoft Project 2016 > Project Options > Edit > Edit options for Microsoft Project
User
HKCU\software\policies\microsoft\office\16.0\ms project\options\edit
Automatically selects the field below the current field after the user presses the ENTER key. If you enable this setting, the field below the current field is selected after the user presses the ENTER key. If you disable or do not configure this setting, the user's default setting is used.