If you already know OOP, it's easy: two tabs per class, one .h one .cpp.
Sure, but the key is to know that you can create additional tabs. That is not all that apparent from the crappy icons on the IDE. Nor is it obvious, or well documented, what creating new tabs means.
Of course, one would think that by the time the project has grown to the size where multiple tabs are going to be helpful, one would have become confident enough to experiment with all the buttons and menu items, and become familiar with the results.