Virtual box shared folder is not mounted in guest

I’m trying to mount a Windows host folder D:Code to a Linux guest system.
To do that, I added it in shared folders (two attempts – both didn’t work):

And there is list of folders on guest Linux system in this state:

My added D:Code folder is not mounted. But as you can see there is a c folder which contains Users (shared from host C:Users)

What I expected is to see code and d on the Linux guest system, but it didn’t happen.
Did I forget to do something?

mkdir /mnt/src
mount -t vboxsf code /mnt/code