You have 2 ways. You can grab the 3d window as long as you are on the loading screen. Once you are fully loaded in 3d hit Alt +Space which opens a context menu, use arrow keys and select “Move” and hit Enter. You cna use CTRL + Arrow keys the mode the 3d view in place. to switch between windowed and borderles mode you can use CTRL+Enter in 3D
Thank you. That did it.