Hello,
if you want to increase the number of rows in pages (plugins, emails, items, comments) on the admin side
Just go to folder oc-admin and find files (plugins, emails, items, comments)
then find this code
if( Params::getParam('iDisplayLength') == '' ) {
Params::setParam('iDisplayLength', 10 );
then change the number 10 to 50 or 100, .. whatever you want.