I use Phpkaox theme that all replies of topics are in threaded of view mode initially. So readers cannot read all contents of a topic aftering clicking it. They must click one of the reply and read the content. Or they must click the buttion "flat" of view mode by themselves. It will not be so convenient for them and they do not used to it. How can I change replies from "threaded" to "flat" of view mode after clicking the topic like XOOPs website? Then readers can read all the contents of a topic after clicking the topic. I have checked the user settings but I cannot find any hints. Any ideas? Thank you in advance

Cheers,
doug

Yes, its pretty simple
find the viewtopic.php file under /modules/newbb/
near the top find these strings
//use users preferences
if (is_object($xoopsUser)) {
$viewmode = $xoopsUser->getVar('umode');
$order = ($xoopsUser->getVar('uorder') == 1) ? 'DESC' : 'ASC';

and make it look like this

//use users preferences
if (is_object($xoopsUser)) {
$viewmode = $xoopsUser->getVar('flat');
$order = ($xoopsUser->getVar('ASC') == 1) ? 'DESC' : 'ASC';

and bam, instant flat for all