While viewing

https://docs.mongodb.com/manual/reference/operator/aggregation/

and trying to close "Query Modifiers" from the Documentation navigation on the left-hand side menu for Reference>Operators>Query Modifiers" doesn't seem to work. I'm clicking on the grey down arrow.

Closing the menu on Reference>Operators works fine, but any subtopic that is 2 levels down, seems to show this symptom. Also see this in Reference>mongo Shell Methods>Database Methods.

Problem exhibits on MacOS 10.14.6 using 3 different browsers:

-Chrome Version 76.0.3809.100 (Official Build) (64-bit)

-Firefox 68.0 (64-bit)

-Safari Version 12.1.2 (14607.3.9)