Please post your code as text in in code block (e.g. Use the button that looks like </> on the toolbar). Be sure to also post the generated code that the designer has made for you. (e.g. The contents of Form1.Designer.cs and Form2.Designer.cs) It's very hard to read any code from a screen recording.
My gut feel is that you actually have a web browser control, an active X control, or some other dynamic control set to fill the contents of your forms. Since those controls are only rendered at runtime, then there is no way for the Forms Designer to show a preview because it doesn't actually run your code while in Designer view.
Someone at work asked about whether we’d be able to use VS 2022 to work on our main WinForms app. It works just fine in VS 2019, so it should work in VS 2022, right? Except it doesn’t. What we get is white screens of brokenness whenever we try to open a Form in the designer. But why?
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