Can't put compoents inside intellij compoenent UI Designer
已回答
I created next form:

And I can't put other component inside com.intellij.ui.components.panels.NonOpaquePanel in UI Designer.
Why?
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Hi,
Please clarify the case. Did you add NonOpaquePanel manually to the palette? Did you check Is Container checkbox?
Ohh yes. I added NonOpaquePanel to own group. I check Is Container checkbox and all fine. Thanks!
Is there some way to add all Intellij UI components to the palette (excluding manually adding each component)?
I don't see such a possibility. See https://www.jetbrains.com/help/idea/customizing-the-component-palette.html.