一、
Setting APP_DEBUG=false in your .env file works fine for the frontend.

If you don't want the stack trace lines to be outputted in the log files only, try this.

二、
In /app/Exceptions/Handler.php add use Log; at the top, then add this in the report function:

Log::error('['.$e->getCode().'] "'.$e->getMessage().'" on line '.$e->getTrace()[0]['line'].' of file '.$e->getTrace()[0]['file']);

And remove:

parent::report($e);