Show Global Privileges: If checked, the Global Privileges tab will be visible in the User Administration section. In that tab, you can grant users global privileges (as opposed to privileges on a database, table, or column level only). This may affect security. See The MySQL Access Privilege System. If unchecked, the Global Privileges tab will not be visible in the User Administration section.

Show Table/Column Privileges: In most situations, it is sufficient to grant either global or database privileges for users. You can hide the Table/Column Privileges tab in the User Administration section by enabling this checkbox.