GNus 5.9.0 tries opening HTML, but text/plain preferred

[Jerry Sievers]

Hello, I'm a long time GNuser but confess to having not been deep into
the docs for a while. 

This is GNus 5.9.0 on Fedora-4.

Anyway, I see that my Gnus is opening the HTML part of messages that
have alternative content types, and in cases where this is totally
bogus MS Outlook HTML, the rendering fails and shows up as raw
markup. 

Gnus manual refers to "The EMacs MIME Manual" for more info on how
Gnus might handle automatic opening of MIME parts.

I dont' find that manual here.

Question; how would I tell Gnus to choose text/plain over text/html
when doing inline rendering of message content?

Thanks

PS: Also curious that "customize group, Gnus MIME is empty of anything
configureable?

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