If you're the owner of a shared folder, you can prevent editors in the folder from inviting other people to it. You can do this when first setting it up, or later on, by going to the folder's options.
When you create a shared folder, deselect the checkbox next to Allow editors to manage membership of this folder.
Deselect the checkbox when creating a new shared folder
Deselect the checkbox in the shared folder's options
Pro and Business users who own a shared folder can change who can invite others to the folder in the sharing settings.
Click Change sharing settings in the shared folder options
Change who can manage membership of the folder