Just as a trial I changed the standard installed "no" for the account registration require approval into "yes"
It worked well, but when I changed back to "no" and hit "save" it will not save but returns to "yes"
How can I get this back on "no" ?

When I change any of the other values, it is saved correctly.

Hi,

We found the bug.

You can fix this by editing, admin/modules/config.php

Around line 17, replace

foreach ($_POST as $key => $value) {

with

if (!isset($_POST['reg_req_admin'])) {
    $_POST['reg_req_admin'] = 'off';
}

foreach ($_POST as $key => $value) {

Yesss, thank you