vorpX shows a tray icon in the taskbar (left to the clock). If it’s not visible, click the small arrow in the tray icon area to open the small window with hidden tray icons. You can exit vorpX from its tray icon’s right click menu.
For 3D in Skyrim SE you need this profile. Make sure to follow the instructions!
In regard to Far Cry 4 please make sure to disable the ingame overlay in the Uplay options. Also go offline in Uplay, the game will crash otherwise after connecting to the Ubisoft server with vorpX.