@ou_bikefly – welcome the the forum!
I have changed the title of your post from “How can I hide the username of POPUP?” to " How can I hide the username shown in login item cards in the browser extension?", and I’ve also moved it from the Feature Request category to the Ask the Community category of the forum.
I think that your only option is to leave the Username field blank, and then create a custom field (of the “Hidden” type) with a name that matches the input field identifier for the username input field on the login form, and a value that is set to your username.
If you have trouble getting this set up, please share the URL of one of the websites, so that we can assist. You may also want to read the documentation on Custom Fields in the Help Center.
@grb Hello. thanks for your reply. I just want to add an option in the extension so that when the pop-up window is displayed, the control switch will display the username, because there will be security issues when the username is displayed on the list (privacy or people around will see it)