How to disable core reports
If you wish to disable the built-in core reports from LearnDash core a solution is available. Add the following constant to your wp-config.php file located on your server in your WordPress installation right above the line that says /* That’s all, stop editing! Happy blogging. */
Example:
define( ‘LEARNDASH_MODULE_REPORTS_DISABLED’, true );
/* That’s all, stop editing! Happy blogging. */