Hi Omega,
What happens when you run the application ? Controls appears or not ?
If yes try to remove the Form from the solution then add it from recycle bin to the solution folder by add existing item.
Or
You must check your Designer.cs code well. You will see that all control that you are created is not added to Form. Some time it required to add controls to form by manually writing code in designer code. Just go and write code to add that controls manually. After doing this rebuild the project and restart the Visual Studio IDE.
Or
Refer below link and try.
https://www.codeproject.com/Tips/420347/Visual-Studio-Editor-Controls-disappearing-at-Desi
