Being set to scaled , it does just scale on the preview ,
when you render , it does render at full ,
But the following app that will receive the footage will apply “the scale” again , and here depends on the app and the codec …
QT if is YUV will apply the scale
QT if RGB will it display as full
FCP apply the scale on SDI (and on the viewer if is YUV)
Flame/Smoke apply scale on SDI
etc…