How to correctly use mapped types

I struggle to define a good types for my use case. Here is what I have: One global object that represents Settings

const settings = {}

This object contains each individual menu mapped Menu title -> Menu settings.

const settings = {
  menu1: {
    showOneThing: true,
    showAnotherThing: false,
  },
  menu2: {
    renderThis: true,
    renderThat: false,
  }
}

I am trying to come up with a function that would return different properties available in the menu, based on what menu is selected. For example

const getSettings = (menuKey) => ...
const settingsForMenu1 = getSettings('menu1');
settingsForMenu1.showOneThing // intellisense and all of that
const settingsForMenu2 = getSettings('menu2');
settingsForMenu2.renderThis // property renderThis or renderThat are the only ones that should be available here

Now for some reason I seem to struggle with concept of generics. I think I need to use the concept of mapped types here, but I really can't figure out how. Would anyone be able to suggest ways to do what I am trying to do?

Thanks