Plesk: Disable Compatibility Mode

The issue is that a domain points to a different folder or the METANET index page when accessed with SSL. The cause lies in the enabled compatibility mode for the outdated option "Separate SSL/TLS content and non-SSL/TLS content." To resolve this, this mode must be disabled in the "Hosting Settings" of the affected domain.

Problem:
The domain points to a different folder or the METANET index page when accessed with SSL.

Cause:
This happens because the compatibility mode for the outdated option "Separate SSL/TLS content and non-SSL/TLS content" is enabled.
To have the website display correctly again, this mode must be disabled.

This option can now be confirmed by unchecking the box: