I just opened my project and then this happened In the first picture, the camera actor glow and the second picture nothing show on my view port.How to fix this can someone help me, please?
Try verfiying engine version on launcher. 
Opening two projects and Saving one might caused this problem.
It doesn’t work sir. 
Maybe you can try open another viewport, main menu > window > viewports > viewports 2 or 3 or 4, see if it works.
Another viewport show the same thing.
Before, this thing happened to my previous project. in the beginning, everything was normal until the next time I opened that project, this thing happened to my previous project, so I created a new project (this project). It happened again. The previous time I opened this project, everything was normal, and now it happened again.
Try this then:
Window → Load layout → Default editor layout
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This has already happened to me. 
It doesn’t work.
You can try migrate the files to a clean project.
Don’t loose any hope. Something will come up, lets keep digging.
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It show me ,Couldn’t migrate package (/Game/Props/old-candle-holder/source/Glass_001) because the asset save failed.
What is that mean?
Sorry for the delay, I was busy. This could be related to the unreal version and other things (But don’t worry, you can just import this specific object after you migrate everything you can ). I think this post can help you: Reddit - Dive into anything
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Hey @GenexiZ
Can you select something in the world outliner on the right and press F(?)
I find everything disappears in the viewport like that if you enable world partion system is there any chance you did that
I’ve tried this just a moment ago, I found that it doesn’t work again. So I will give up and start my new project , Thank you very much for taking the time to helping me.
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I didn’t enable world partition system, I just opened this project and this thing happened.
Thank you, it helped me
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Ok, it happened to me, and found out the reason (well at least in my case).
I must have accidentaly set the Near Clip Plane value in the Project Settings to 0. After putting a non-zero value, and closing and opening the editor, everything comes back to normal. I am even able to reproduce this, I can be switching between 0 and 1 and the behavior is consistent.
