I'm a techie and it's not intuitive for me either. Honestly, their UI is just bad, despite being my choice of a password manager. It's not a matter of habit, I stumble upon it every damn time I have to open its extension window.
I've had this issue before. If you're on Firefox, open up the history sidebar with ctrl + h,then in the top left corner click on the word History to open the dropdown and select Bitwarden. You'll be able to have it "open" without clicking the extension popup.
No, I have no trouble opening it (sorry that I wasn't clear enough). I meant that my entire UX in that window is full of mistakes and confusion. To name a few, clicking on an item shows "unable to autofill" message as if I wanted to autofill my gmail password on other sites and not open a card. Lock button is hidden obscured in a settings menu. Password length slider is too sensitive in a generator tab. And the window is always not high enough to include most important options. It feels half-assed all over the place.