I am using Chrome Version 83 and this is how I did it. Before following the steps make sure the tab of the site, whose Auth Details you want to delete is closed.
First, go to Settings >> Privacy and security.
![enter image description here]()
Then click on Site settings option
![enter image description here]()
Then click on View permissions and data stored across sites option
![enter image description here]()
Search for the site whose Auth info you want to delete. In this example, I am using Stack Overflow.
![enter image description here]()
Now click on the site and then click the Clear data button.
![enter image description here]()
Now restart your browser and you will be asked for a fresh login. For restarting you can type chrome://restart in the address bar.