'Hides/Shows the left zone' button is missing

The ‘Hides/Shows the left zone’ button seems to be missing in Dorico Pro 4. Windows version

I don’t know if it’s been already reported four times or five times… Well, now everybody knows about it. And yes, it’s going to be fixed in next update. Ctrl-7 should help you here. :wink:

Yes, it’s been reported before: