To Change VScode default Setings,Please access to following folder:

C:\Users\ {Your User Name}\AppData\Roaming\Code\User
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And Open the settings.json.

For example, if you want to Extend Emmet abbreviations, so you can format any element to HTML Format. i.e. test will become <test></test>.

You can simply add following in json:

{
    "window.menuBarVisibility": "default",
    "terminal.integrated.shell.windows": "C:\\Program Files\\Git\\bin\\bash.exe"
    "emmet.triggerExpansionOnTab": true          // <-- added line
}
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to settings.json.