Don't see the cube under layout instead i see key frames. How can i get back the layout screen in 2.9 This is my 3rd day in Blender 2.9. When I go to the blender Layout tab I see the keyframes. When I tried to pull it down by holding the corner I get more layers of keyframes. How do I get back to the default screen that shows the cube? Here is the image.
Click on the little clock icon in the top left corner of Blender's window (arrowed below).

That will bring up the window selector and you can click on 3D Viewport to bring back your editing window: