My bird has a favourite spot too. I think definitely leave it.
If you want to encourage your bird to go in other parts of the cage, you could use food and treats placed around the cage to encourage exploring.
For example, the cage I have has a place where the food bowls have to go and they are positioned down low. These bowls are never moved and they only have water and pellets in them. When my bird is hungry she has to climb down there.
I also have two other food bowls that I can place anywhere in the cage, this is where I put fruits and veggies, sometimes seeds, or once-in-awhile foods.
I often place the cup with treats in a part of the cage that I want her to go into more, like a back corner, or a place where she can only get to by a specific perch that she is hesitant to go on. That way she starts to associate other parts of the cage with good things too and become more inclined to explore around her cage more.
I also think it's good that it makes her have to climb around to get different types of food because in the wild parrots have to search around for a variety of foods from different places.