P: Noise reduction effect not displayed in Develop mode

Sorry, but no matter what you see or imagine, noise reduction is only accurate and visible at 1:1 view. What you're seeing when you fit is simply an approximation of some sort. If you need to see exactly what you're NR looks like, then either zoom 1:1 or use the preview window in the Details tab.

Same problem here, no NR is displayed at all in my standard "fit" view but is applied when i zoom in.  Unlike the above my white balance has no effect on this.
This is a different behaviour from LR6 and CC which did update NR on the "fit" view quite happily.
Confirmed this by running LR6 with the same catalogue and image.

Its a fairly serious bug as i really cant tell whats happening to my image when making changes if the whole thing appears with noise.

UPDATE: If i have noise reduction at 100%, with the size set to "fit" and White Balance at "auto" the noise reduction effect shows up in "fit" size.

Basically it seems to be linked with the white balance.
If WB is "auto" NR shows in "fit".
If WB is anything other than "auto" NR doesnt show in "fit"

Looks like a glitch to me...or maybe noise reduction is linked with camera WB. Anyone else seeing this?

Also, all my already edited files show NR at "fit"

I found a sign '!' with an explanation, but it worked well in LRCC before upgrade to Classic without zoom to 1:1. Is there a way to configure Classic do same?

I think this is a new issue with LRCCC I have this same issue. All my old files(pre LRCCC) show noise reduction at "fit". Any new file i import doesn't show noise reduction in develop module.

It's always been that way. There's even a little ! mark in the Detail tab which explains the issue...

That's not new. LR doesn't display noise reduction or sharpening results except at 1:1 or above. They're still there, and will export correctly. But they aren't rendered at less than 1:1. After they are exported they are "baked in" and visible at any size.

In addition. When press before/after button and copy 'after' settings to 'before' - 'before' image displayed with noise reduction, 'after' image without.