To
delete a region from a page, you must have at least one of the
following privileges:Deleting a region from a page changes the entire landscape of the page. Once you've deleted a region there is no way to reinstate it, so be sure that's the action you want to take.
If the region you are deleting contains portlets or items, you are prompted to specify where you would like to relocate them. If the region contains tabs, however, you cannot relocate them within the Delete Region screen—you must either delete the region and all its contents, or cancel and relocate the content before deleting the region.
To
delete a region from a page, you must have at least one of the
following privileges:
Manage All privileges on the page group to which the page belongs
Manage privileges on the page
Manage global privileges on All Pages
If you have Full Customization privileges on a page, you can delete regions from your own tabs when you customize the page; you cannot delete regions anywhere else in the page.
Go to the page with which you want to work.
Switch to Edit mode.
In the page toolbar at the top of the page, click Layout.
Click 
in the region you want to delete.
If the region contains portlets or items, you are prompted to specify where you would like to relocate them. Use the radio buttons to make your selection, then click Move Content. Alternatively, click Delete Content to remove the region and its contents.
Note: You can only move portlets to another portlet region; you can only move items to another item region.
If the region contains tabs, you are reminded that deleting the region will delete all the tabs within that region and remove all the portlets and items on those tabs. Click Delete Region to continue, or Cancel if you want to move the portlets or items before deleting the region.
Every page contains at least one region. If there is only one region in a page, you will not be able to delete it.
Deleting a tab
Moving an item
Moving a portlet to another region