Position of Folder Tabs, horizontal to vertical

Can we change position of Folder Tab, horizontal to vertical?
Why? Look, it is more compact!

Yes, under Preferences / Folder Tabs.

It will be in future release or already exists?
My version 11.19
I see something on screenshot here:
Downloads -- Screenshots -- Dark Grey-Blue EF edition (WIP)
Dark Grey-Blue EF edition (WIP)

It's in Opus 12.