Landscape, Paint, Place tool disappeared

I’ve been working on a new level in UE4 and I’m having issues with the landscape editor tool. For one, it is not visible and no where to be found. This is preventing me from making new landscape or simply placing lights. At first, it would launch two separate windows when I started my project (project window and landscape editor/lighting/bsp tools), and now it only launches only the project window. How do I bring the Landscape window back, and how do I keep it there? I really can’t do anything right now because of it and this sucks.

I am facing same issue.