Metadata configurations radio buttons or checkboxes

Hello, 

I am struggling with radio buttons and check boxes.  I find that sometimes they work and sometimes they don't.  Are there any rules for them such as radio buttons only for boolean and checkboxes for more than one?

As an example, this property only works with radio buttons:

but if I select check boxes, it appears as a dropdown

I am finding this difficult to understand.  I am always trying one thing and if it does not work, I try the other option. 

I appreciate some guidance.  Thanks in advance, 

Irene

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