MUI exposes componentsProps on some components to let you override the props of the inner components. Specifically:

• In Autocomplete component, it's used to override the AutocompleteClearIndicator props.

• In StepLabel, it's used to override the label component (exclude the icon). Also note that the API is not inconsistent as @Drew Reese pointed out, you can only override the label props with componentsProps, but to override the icon props, you have to use StepIconProps prop instead.

• In some other components like Menu, there is no componentsProp but TransitionProps and MenuListProps props to override the components inside individually.

Unfortunately, because there the prop is untyped (all marked as object), and there is no mention anywhere else in the docs. You have to dive into the source code to know what the componentsProps in a specific component does.

Below is the example of the Autocomplete component with the clear indicator removed. Note that you can do that with disableClearable in Autocomplete, this is just an example to demonstrate how the componentsProp can potentially be useful:

<Autocomplete
  componentsProps={{
    clearIndicator: {
      sx: {
        display: "none"
      }
    }
  }}
  options={top100Films}
  sx={{ width: 300 }}
  renderInput={(params) => <TextField {...params} label="Movie" />}
/>