View mail MIME - customize size

Hi, sometimes I go through old mails and save them in a folder by subject.
Opus displays this to my full satisfaction, it just defaults to a small view.
And making everything progressively larger, when browsing quickly, is quite inconvenient.
I haven't found anywhere to customize the view.
Any tips?

The MIME viewer is written by Microsoft. We have no control over it. (You should see the same results in File Explorer.)

Thanks Leo, I'm just wondering if there's a "trick"/script for that.
Have a nice day
Jirka

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