Carry out the following steps:
Navigate to the Dashboard and click on Full Sitemap.
Click on the Home page and then Set Permissions.
Click on Add Sub-Page and select the second tab, Details:
In this dialog, select Custom next to Editors and select all page types you want the editors to use for new subpages.
Confirm the new setting by clicking on Save.
If you have a person who's only responsible for managing press releases, they only need one page type. By using the advanced permission mode, you can make sure that they don't see and have to be concerned about the other page types.
This is useful if your website gets bigger and has lots of page types. However, keep in mind that it might help your end users, but it also increases the effort necessary to manage the website.