The typical behavior for apps when tapping/clicking out of focus of a pop up dialog, such as the menu where you can select which Collection you want to view, is to dismiss the pop up dialog, and not register it as selecting something "underneath" the menu. I've included a video clip displaying exactly what I'm referring to.
Video link (hosted on Imgur): https://imgur.com/a/kMm2VGj
(In the video, you'll see a circle that represents where I've tapped on the screen, as well as an area blurred out, which is the pop up menu I'm referring to. I blurred it out for privacy reasons.)
1Password Version: Latest iOS Early Release
Extension Version: N/A
OS Version: macOS