tempo recognition - "smooth tempo" greyed out

How can I use the “smooth tempo” function? It is always greyed out here.

Thanks! Stefan

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This has always been the case for me also.

I have resorted to manually editing the tempo track to remove the jumps, but surely there is a better way.

I see several threads here, but haven’t found one with an answer. It’s almost as though the feature isn’t actually there!