Hello Wendilla.
It's always nice to see birds fly, however, there are risks with letting your birds fly freely indoors.
They can fly in to windows and glass doors very easily. I have known birds to die like this. There are a lot of obstacles in a house that a bird can fly into, this in turn can cause many injuries.
I have been breeding parrots for many years and I always clip the flight feathers. But I always leave two or three feathers on the very end as this looks a lot nicer. I have known people to hack off a birds wing to the point that the feathers will never grow back again.
If you want to let them fly safely may I suggest using a parrot harness. This can allow the bird some freedom of flight outdoors. Better still if you have the room and money, why not invest in a flight aviary. We have one in our garden and it's great for the birds to fly without the worry of injuries and escaping.
Good luck with your macaw.