In the Schema Browser, I select by database object, then I select the scripts tab on the right. I want to change some settings such as whether or not the schema name gets qualified, what indexes should appear in the script, or whether to include storage clauses.
On the scripts tab, you'll find an icon that looks list with check marks. When you hover the mouse cursor over it, it'll say "View/Edit Script Options." Click on this icon to enter the options menu for Scripts.