Hi there,

Thanks for contacting us. Sorry for the inconvenience. Will you please follow the instruction to find out the solution.

1. Enable the Error Reporting https://prnt.sc/wbqvjk
2. Disable the SEF https://prnt.sc/wbqvuw
3. Disable the JCE editor https://prnt.sc/wbqwai
4. Then try to check the front end editing.

Note: Before apply this process, Please keep a backup of your site. If you cannot find out the solution. Please make an akeeba backup & share with me the zip file. I will check from my end & let you know the solution after investigation my end.

https://drive.google.com/file/d/1HwEmKAzw-uVWQHdASGHU31nJaJKBSR56/view

-Thanks