Edit metadata - select another page for thumbnail

[HaveClassWillCode]

Some magazine PDFs have an advertisement as page 1.
It would be great if you could edit the metadata, and point to page 2 or 3 to get the proper magazine cover, which is then used for the thumbnail.

[gotson]

You can already do that, open the book with the reader, and use the 3-dots menu and select"Set page as poster for book"

[HaveClassWillCode]

Thanks!
I was utterly confused as I didn't see those icons.
I'm new to Komga, but had read the docs, and did click around, so was utterly confused.
By accident I now found that I have to click on the page to see these icons...