Hello,
I saw you are using Porto Admin 1.5.2 that’s a very old version. Note that Porto Admin 1.5.2 is based on Bootstrap 3, and the latest version of Porto Admin is based on Bootstrap 4. This is a major change and just updating the CSS stylesheets/plugins will break the layout. Unfortunately there’s no easy way to make that. Will be needed a lot of manual work changing HTML classes in the source code.
The best way is use this migration guide:
https://getbootstrap.com/docs/4.5/migration/
With migration guide above on hands you can see wich classes changed from BS3 to BS4 and make the needed changes.
We hope this helps!
Let us know if you need further assistance.
Kind Regards,
Rodrigo.