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The textarea function parameters:
XoopsFormTextArea(caption, name, value, rows, cols, id)
To change the contact form comment area , edit line #37 of modules/contact/contactform.php
from
$comment_textarea = new XoopsFormTextArea(_CT_COMMENTS, "usersComments", $comment_v);
to
$comment_textarea = new XoopsFormTextArea(_CT_COMMENTS, "usersComments", "", 6, 40, $comment_v);
This text area will have 6 rows and 40 columns.
Adjust the row and cols values to suit your needs.