Thanks for your time and effort taken to help me. I was able to resolve the problem after reloading the font awesome libraries on my computer.
Thanks for sharing your work.
One thing I noticed on mobile screen (touch) is a confusion about a submenu closing.
That problem doesnt exist on the desktop.
How difficult it wold be to have a ‘-‘ sign on top of the dropdown indicating the possibility to minimize similar to existing ‘+’ sign indicating the possibility of maximize?
Even better how about the arrow up or down icon?