**The problem:** I dont see 'All files' in Sharepoint Designer:'

[![enter image description here][1]][1]

I have full administrator rights of whole Sharepoint. 

When I open:

    mySPwebsite.com/teams/sandbox/Gedeelde%20%20documenten/Forms/

I do see the All files option.

But, when I open:

    mySPwebsite.com/teams/Bedrijfsvoering/Verkoop/Documenten/Forms/

I don't see the All files option.

What is going on?

Thank you!

  [1]: https://i.sstatic.net/2IL7C.png