If you are looking for specific applications of this term across different contexts, here are the primary "features" it describes:

Straight Up (2019) is a feature film directed by James Sweeney that explores themes of OCD and unconventional romance.

In its most literal and direct sense, a feature refers to a vertical orientation or something positioned perpendicularly to a base.

In mixology, a "straight up" feature means a drink has been chilled (shaken or stirred with ice) but is strained and served without ice in a stemmed glass.