This extension will allow you to put your tabs outside in a new window. And also to create a separate group. In fact, this extension of TabControl which allows it to work in different WPF windows.
Install-Package Tabber -Version 1.0.6
dotnet add package Tabber --version 1.0.6
<PackageReference Include="Tabber" Version="1.0.6" />
paket add Tabber --version 1.0.6
Insert for new tab fixed.
This package has no dependencies.