With Edit change item you get to choose three types as long as that type is Set.

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When are the options 'remove' and 'add' not greyed out?
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You mean with the Change Object action in microflows? Add or Remove can be useful when working with reference sets, where you can add/remove an individual object to/from the set.

If you look at the reference set selector, that's exactly what the Add and Remove buttons do. In the background they change your main object and add/remove the items you selected through the reference set selector.

https://world.mendix.com/display/refguide6/Reference+set+selector

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