SF2 files generally do not have "key switches" (keys that change the playing style). You usually have to load separate patches for different styles.
If you are looking for specific names to search for, these are the "gold standards" in the free SF2 community: violin sf2 patched
stands for SoundFont 2. It is a file format that contains sampled audio data (wavetables) and synthesis parameters. Unlike a full VST plugin which processes audio in real-time using complex scripts, an SF2 file is essentially a map of recorded notes that a "sample player" (sampler) reads. SF2 files generally do not have "key switches"
A SoundFont is a file format that bundles audio samples with instructions on how to play them—essentially a virtual instrument in a box. When a violin SF2 is described as "patched," It is a file format that contains sampled
Beyond the Samples: The Art and Science of SF2 Violin Patching
If you're looking to upgrade your string section without breaking the bank on expensive VSTs, these community favorites are a great place to start: Violin Express SF2: