As you have shown in your image you can pin a camera, but if your character has multiple camera components you can only preview and pin the first one (I believe its the one highest on the component list), you can’t preview the others at all.
Yes i would like the ability to preview camera components in blueprint mode.
I understand now. I have entered a report in our bug database as UE-12428 (“Can only preview one camera from a Blueprint actor in the level viewport”). The feature request for BP Editor camera previews was previously entered as UE-8930.