Hi Guys,
Under "websites and domains" tab, when you click on your domain name, Plesk will display the available PHP handlers and other options. But in some weird cases, it won't show these options.
To fix this issue, please login to your Linux machine and execute the script given below.
mysql -uadmin -p`cat /etc/psa/.psa.shadow` psa -e "update misc set val='0' where param='vps_optimized_mode_status';"
That will fix all issues.
Give it a try!