Generally when working with C++, you want to be launching your Editor from Visual Studio (or another IDE of choice). There are some types of changes that are safe to make and update while the Editor is running, but many other where you will see more correct results if you shutdown the Editor, build and relaunch from the IDE. Creating new classes is one such case where I would recommend relaunching from your IDE.
C++ as a language is getting better at this, but other parts of the engine don’t work well with Live Coding (which is what this is called). But it’s superior to Hot Reload (the previous version which could corrupt your blueprints sometimes).