2d Orthographic Views is not working

My 2d orthographic views is not working, it is blanket out, I only see the perspective view, the top view, bottom view, b ack view, sides views all of them is blanked out. They were working before, on my U.E. 5.8.3., so it prevent me to measures distances. How can you active them in order to work properly! Thanks in advance!

I’ve had this happen a few times in various engine versions. Could usually fix it by selecting a view, then changing render mode back and forth between lit, unlit, or wireframe and restarting editor.