Ho to grant access for a global user to a subwiki space?

Is there an option to only allow access for a global user to a specific space (and its children) in a subwiki?

Illustration:

subwiki
|
___page 1
|
___page 2
|
___page 3

User test should get editing rights for page 1, but not for 2 and 3. Without granting viewing rights to the whole wiki basic wiki functions are broken (see attached screenshots).

How to grant access for only this user to only this space?

Thanks in advance.

Screenshot_20221129_120941_editor

Screenshot_20221129_120516_page

Screenshot 3 shows admin view (how it is supposed to look)

Screenshot_20221129_121535_admin_view