Go to this example and then go to Codesandbox and you will see that the result of the example differ from what is shown on the example page.
Example is supposed to be changed based on provided theme styles, but this is not happening. Not really sure what it is related to.
In documentation:

In sandbox:

https://github.com/JedWatson/react-select/pull/2839
Read the last couple comments.
@danpoq hm, I'm a bit confused, any date when it is planned to be released?
Same issue with theme overiding ,got any solution?
@sahibjotsaggu
Hello -
In an effort to sustain the react-select project going forward, we're closing old issues.
We understand this might be inconvenient but in the best interest of supporting the broader community we have to direct our limited efforts to maintain the latest version.
If you aren't using the latest version of react-select please consider upgrading to see if it resolves any issues you're having.
However, if you feel this issue is still relevant and you'd like us to review it - please leave a comment and we'll do our best to get back to you!
Most helpful comment
@danpoq hm, I'm a bit confused, any date when it is planned to be released?