The Syncfusion® native Blazor components library offers 70+ UI and Data Viz web controls that are responsive and lightweight for building modern web apps.
.NET PDF framework is a high-performance and comprehensive library used to create, read, merge, split, secure, edit, view, and review PDF files in C#/VB.NET.
The designer layout in Dashboard Designer is a build in component and it is not available right now as a control. You can achieve your requirement by using WinForms Docking Manager. Please refer the following UG documentation and samples to know more about Docking Manager.