Am i able to edit the searchability of native record field. In this case, the MPN field of an Item record. Where is the field record? Is it hidden? Its pretty dumb that as an admin i dont have full admin privileges'. Let me break my system that i paid for!

Some fields are available via search, some are not, if you don't see them, odds are they are not. Refer to the records browser and check out the "Search Filters" and "Search Joins" section. https://system.netsuite.com/help/helpcenter/en_US/srbrowser/Browser2023_1/script/record/item.html

shouldve added that i want to make it available for global search.