Was working fine till I decided to install extension after a long time

Hi,
After Feb this year when I finally figured out how 1Password works in browsers, I used to click the icon in the menu bar in Mac and then click and fill for respective websites. I thought why not install extension as it has been long and installed it on Brave. But it is still the same, the extension won't let me fill on any opened website already but shows the button which opens a new page in another window and fills the fields of login and password.

I didn't like it then and not now so removed the extension from Brave and decided not to try with any browser. Now I'm not getting the option to fill the fields for any opened website (despite saved logins) but I only see this. I want to go back to the old way.

Please help.

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1Password Version: Version 7.8.7 (70807004)
Extension Version: Not Provided
OS Version: macOS Big Sur 11.5.2