Why enable DLSS plugin lock quality mode to 3?

Development Pipeline & Plugins
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Hi all,

I am trying to enable DLSS in my project, but I am not sure why the quality mode is locked into 3. When I disabled DLSS, the quality mode is back to configurable.

This is what I am using at the moment

image (5)
image (5)1558×782 127 KB

And I am trying to resolve this issue

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image (4)900×49 4.99 KB

Any advices or suggestion would be greatly appreciated.
Thanks