The Resolve companion app is most useful as a tool to follow along with people in VR during meetings. You can learn more about that in the following article:
You can however also use it to move around the model independently. Here's how:
Drag the mouse while holding down the left mouse button.
Use the arrow keys or the WASD keys on your keyboard to move in the direction you're looking in.
Fly straight up or down
Use the Q and E keys to fly straight up or down. This is useful to move between floors.