DirectVR takes care of that in both games. In HL2 via the memory scanner, in case of the Bioshock remaster via auto editing the game’s ini file. You should have seen a message in the top left corner of the game window and in the headset that prompted you to restart the game when vorpX adjusted the FOV setting in the .ini.
BTW: if possible use the original Bioshock in DX9 mode, that’s the best way to play Bioshock with vorpX
BTW2: To learn a bit more about FOV (field of view) and why it is important, check the “Essential Hints Guide” in the vorpX help, or alternatively here