Account Settings > Preferences
The customise the site selector, click your name in the top right of the screen (on any screen) and select "Account Settings".
Then select the "Preferences" tab, this will load the "Site Selector Settings".
Favourite Site and Hidden Sites
To favourite a site (so that it appears first in the site selector), drag the site into the "Favourite Sites" column. To unfavourite a site, drag it back into "Regular Sites" or even into "Hidden Sites" if you wish to hide it.
To hide a site (so that it no longer appears in the site selector), drag the site into the "Hidden Sites" column. To unhide a site, drag it back into "Regular Sites" or even into "Favourite Sites" if you wish to favourite it.
