If I’m understanding you correctly, you want to remove predictive suggestions, yes?
The text below is from https://support.google.com/chrome/answer/95656?hl=en&ref_topic=14676
The prediction service is typically turned on by default. Follow the steps below to turn it off.
Click the Chrome menu on the browser toolbar.
Select Settings.
Click Show advanced settings.
In the “Privacy” section, deselect the “Use a prediction service to help complete searches and URLs typed in the address bar” checkbox.
Keep in mind that the address bar shows matches from your browsing history, in addition to predictions. If you don’t want to see matches from your browsing history, clear your browsing history.
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EDIT Now I see that I’m mistaken.
Here’s how to delete saved logins, from https://support.google.com/chrome/answer/95606?hl=en&ref_topic=3421433
Click the Chrome menu on the browser toolbar.
Select Settings.
Click Show advanced settings.
Click Manage saved passwords in the “Passwords and forms” section to see a list of all the usernames and passwords that have been saved.
Windows, Linux, and Chrome devices users: In the Passwords dialog that appears, use your mouse to hover over the site whose password you’d like to remove and click the X that appears on the right.
Mac users: You can remove your passwords in the Keychain Access dialog that appears.
You can also use the Clear Browsing Data dialog to remove all password records saved during a specific time period.