Sensitive Directory Check Needing Attention

I just installed Cyberpanel and whmcs on my server and there is a warning in whmcs that i can’t get rid of:

Sensitive Directory Check

One or more sensitive directories are accessible from the web:

/vendor

Please refer to our Further Security Steps for information.
https://docs.whmcs.com/Further_Security_Steps#Vendor_Directory

anyone got an idea on how to fix it? i cant find any info about it