[HELP] Question about downscalers/resizers.

[Selur]

Because it still looks "active",its not faded ou

Yes, that's by design and is probably not to change.
a. To be sure, you can look at the Script Preview to see whether your settings are active or not.
b. "Settings under Filtering->Vapoursynth->Frame->Resize" only 'overwrite' the 'Filtering->Base->Resize->Picture Resize->Resize method' choice. If 'Filtering->Base->Resize' isn't enabled they are not used.

Anyone can help me ?

No me, no clue. Some resizers are better suited for some content than others. Some resizers are used for upscaling only, others for downscaling only and others allow some filtering even if no actual scaling is done.
Don't know of any site which does a comparision of the resizers and their effect when up-/downscaling different content by different scaling factors.

Cu Selur