How to modify domain's configurations in Plesk permanently

Question

How to modify the domain's web server configurations in Plesk permanently?

Answer

The recommended way to modify virtual hosts settings is using the Plesk interface in Domains > example.com > Apache & Nginx settings or in the Service Plans menu.

Additionally, it is possible to create and edit custom web server configuration templates.

Refer to this documentation page for more instructions:

Changing Virtual Host Settings Using Configuration Templates

Warning: Do not change the default templates. To introduce your changes to the configuration, copy the required templates from /usr/local/psa/admin/conf/templates/default/ to the /usr/local/psa/admin/conf/templates/custom/ directory, preserving the directory structure, and then modify these copies. It is possible to create new templates from scratch and place them in the custom/ directory according to the default structure.