in \include\staff\settings-system.inc.php:
<?php
$pagelimit = $staff->max_page_size ?: $cfg->getPageSize();
for ($i = 50; $i <= 500; $i += 50) {
$sel=($pagelimit==$i)?'selected="selected"':'';
echo sprintf('<option value="%d" %s>'.__('show %s records').'</option>',$i,$sel,$i);
} ?>
or you can use a custom set with:
<?php
$pagelimit = $staff->max_page_size ?: $cfg->getPageSize();
//for ($i = 50; $i <= 500; $i += 50) {
$pagenum = array(5, 10, 25 ,50, 75, 100, 250, 500); //edit it to your needs
foreach($pagenum as $i) {
$sel=($pagelimit==$i)?'selected="selected"':'';
echo sprintf('<option value="%d" %s>'.__('show %s records').'</option>',$i,$sel,$i);
} ?>