Converting UI parameters
For this step, not all actions need to be done. It depends on what’s configured in your original UI. See each specific tutorial for details.
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Application uses a custom widget set → 
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Application uses a custom theme → 
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Application uses push → 
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Application needs to manage the VaadinSessions → 
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Application uses an advanced custom UI logic → 
Other Parameters
For @Title, you should use @PageTitle from the com.vaadin.flow.router package. For @Viewport, you should use @ViewPort from the com.vaadin.flow.component.page package.
After converting those parameters, you can progress to the next step.
The next step is Adding Legacy Components to Flow Layouts.
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