Auto-size comment box

There is no setting for that.
You can fill in Table IV-A10: Custom style:

.wppa-comment-textarea-1, .wppa-comment-textarea-2 {
max-height: 2000px !important;
}

Thanks for the quick reply.
When I copy the text you provided in IV-A10 there is a red cross after the custom style box and I get a popup window with the error message “undefined”.
I also tried with only textarea-1 as this is the box I would like to enlarge but I don’t succeed in leaving the custom style field successfully.

Can I somehow get more information about the error message?

Kind regards,
Dirk

On my live website (https://photona.org) your proposed workaround is working fine. On my development site only I get the error message.

Any idea on what could be missing?

Kind regards,
Dirk

The red cross means that the nonce field ( = security code so no one else can change your settings by issueing a clever url to the ajax procedure ) is expired. Log out and in again.

Logging out and back in solved the problem indeed.
Strange that I could continue doing other changes.

Thanks a lot!