Defender icon shows alert - How to clear that?

I recently upgraded to the latest version of Windows which is great by the way. I have a question about the Windows Defender. It alerted me that my disk space was low and offered to delete previous versions to free up space. Great did that and it freed up like 50 gigs on my SSD so great!

Now the Defender icon still has the yellow triangle there which I would have thought would have been removed as that was the only issue.

Tried to figure out how to "reset" it but could not find anything. Anybody know what to do?

Thanks

It could be that you use a different antivirus software, which turns off windows defender. And that's why you get that triangle.

Not the case here. There is no other antivirus software installed on this machine.

When you open the Security Center, is there any notification?

It has self-resolved. No action taken on my part.