You may edit the title, short URL, and the layout by selecting the page in the Site Map of the Site Center and then clicking the Gear icon.
Minisites are indicated by the globe icon to the left of the folder icon.
You may change the title and the setting for requiring login (private sections) by selecting the minisite in the site map, clicking the Manage Minisite button, then clicking the gear icon as pictured above.
Navigation Header and Hidden Folder Settings
These types of sections are indicated, respectively, by no icon to the left of the folder icon and a folder with a red eye and slash next to the folder icon.
You may only edit the title of these sections by selecting the section in the site map and then clicking the blue Edit button.