How to change default index type for a domain in Plesk?
Note: If the options described are not available in Plesk GUI, contact the server's administrator or the hosting support.
Note: By default, the index order sets *.html with more priority than the *.php files.
Click on a section to expand
For Plesk on Linux
For Plesk on Windows
To change the default document for all domains, use instructions available in the following article:
How to change the default index for all websites?