I just want to get rid of these yellow rects that keep popping up in IntelliJ IDEA.
The "class name popups" are actually called breadcrumbs and can include other things such as method names. They're clickable and used to ease navigation. You can disable them in the IntelliJ Preferences by going to Editor -> General -> Appearance and unchecking Show breadcrumbs. See my image below.
来源：https://stackoverflow.com/questions/42616133/remove-yellow-class-name-popup-breadcrumb-from-intellij-idea