Use Team Foundation Version Control(TFVC) at Visual Studio Code

Depend on what's Visual Studio you installed on the machine, visual studio code's TFVC location will be different, following is an example for vs2015 and vs2017 for your reference.

// example tf.exe location for visual studio 2015
{
    "tfvc.location": "C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\Common7\\IDE\\tf.exe",
    "tfvc.restrictWorkspace": true
}

// example tf.exe location for visual studio 2017
{
    "tfvc.location": "C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\Community\\Common7\\IDE\\CommonExtensions\\Microsoft\\TeamFoundation\\Team Explorer\\tf.exe",
    "tfvc.restrictWorkspace": true
}

Put your own setting depend on what Visual Studio you installed.