[Autocomplete] Grouped Label Styling does not seem to work

[amalcltpba]

Grouped Label Styling does not seem to work.
Unable to change the BACKGROUND Colour for the Group by LABELS

Ref URL - https://material-ui.com/components/autocomplete/#grouped

[ZeeshanTamboli]

Hi @amalcltpba
Please provide a CodeSandbox of what you are trying to achieve. This template (https://material-ui.com/r/issue-template-latest) maybe a good starting point. Thanks!

[github-actions]

Since the issue is missing key information, and has been inactive for 7 days, it has been automatically closed.
If you wish to see the issue reopened, please provide the missing information.

[tylerben]

For anyone else that comes across this, I ran into the same issue and resolved it by using slotProps to target the styling on the popper slot.

<Autocomplete
   ...
  slotProps={{
          popper: {
            sx: {
              "& .MuiAutocomplete-groupLabel": {
                lineHeight: "1.4rem",
              },
            },
          },
        }}
/>