When information is organized in folders, files, menus, categories, etc., you can explain where a particular thing is by saying that it's "under" some heading.
- a photo that's in a folder called "Pictures" on your computer is "under 'Pictures'"
- the setting on your TV that controls its brightness might be "under 'Settings'"
You can also say that something is "filed under ___":
A: Where did we put last year's tax return?
B: I think it's filed under "Finances".