I split my screen into two by using the vertical split function and when I merged the two screens the materials/colors on my mesh’ disappeared and I can’t get them back. When I merged the two screens I did the mistake by dragging the screen without color onto the one without color.
I have restarted Blender afterwards in hopes that I would be able to apply materials to the mesh - but without any luck.
Also I can see I have 4 materials for the plane and have tried to delete it, but I don’t know how.