How to make sure "alt+z" is for typing Greek Omega in visual studio code

Just click preference of vscode and then in the json file, add:

{ "key": "alt+z",      "command": "-editor.action.toggleWordWrap",
                         "when": "editorTextFocus" }

in the keybinding.json.

This is from: https://code.visualstudio.com/docs/customization/keybindings

Removing a specific key binding rule

You can write a key binding rule that targets the removal of a specific default key binding. With the keybindings.json, it was always possible to redefine all the key bindings of VS Code, but it can be very difficult to make a small tweak, especially around overloaded keys, such as Tab or Escape. To remove a specific key binding, simply add a - to the command and the rule will be a removal rule.

Here is an example:

// In Default Keyboard Shortcuts  ...  { "key": "tab", "command": "tab", "when": ... },  { "key": "tab", "command": "editor.emmet.action.expandAbbreviation", "when": ... },  { "key": "tab", "command": "jumpToNextSnippetPlaceholder", "when": ... },  { "key": "tab", "command": "acceptQuickFixSuggestion", "when": ... },  { "key": "tab", "command": "acceptSelectedSuggestion", "when": ... },  ...    // To remove the second rule, for example, add in keybindings.json:  { "key": "tab", "command": "-editor.emmet.action.expandAbbreviation" }