Unable to turn off code suggestions in Visual Studio Code

Turn them off with the following entry in your settings.json:

• "editor.hover.enabled": false,

disable the hover function. You will still be able to use CtrlR + K and CtrlR + I as needed.

You turned off code completion correctly. But parameter hints are still active. Turn them off by going into the Settings menu, searching for editor.parameterHints.enabled, and un-checking the box.

Or put the following entry in your settings.json:

"editor.parameterHints.enabled": false

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If you ever want to see the parameter hints on-demand, refer to How to trigger parameter hints in Visual Studio Code?. In short, for Windows/Linux, Ctrl+Shift+Space; for Mac, Cmd+Shift+Space.