Adding free roam ability

I’m trying to modify the template First Person Shooter that came with UE4 installation. I have removed the mannequin arms from the model, and currently trying to figure out a way to add free-roam ability.

Preferably, I want to toggle between free-roam and normal view on a button click. In addition to the C++ script, I would also like to know if the same thing is achievable through blueprint scripting.