I like to work with notebooks and collapse cells containing computations. This gives me a manuscript-like feel for the notebook, and I like the aesthetics of it. MMA 11.3 introduced a new "feature" that now places a ⍰ symbol after the text in the parent cell. It's easiest to show an image of the code:
This was definitely not there in MMA 11.2. Does anybody know how to turn off the "question-mark-in-a-box"?