Is there a way to disable the “Create/New” or “Connect” button located at the toolbar of a section/group in case at least one object is already present in that section/group.
The purpose of this is to make sure there should only be one object added or linked in a section/group.
You can enforce that only one object can be connected by enforcing a one to many relationship on the mentioned group. Although this will not disable the buttons mentioned.
If you wan to disable these buttons you have to fully customized the used property page