When you hover over the "COMMENT MODE" in the Aggregations tab in Compass, there is no Toggle Switch text. It does not follow the standard operation of the other toggle switches on the screen. I.e. There is hover text for "SAMPLE MODE", "AUTO PREVIEW", and the stage toggle switches.

Also, the textbox reserved for the hover text is too small. There's more text than will fit inside the box making the hover text almost invisible.