I believe to achieve this, you'll need to create a customization project. Within the project, you can navigate to the specific screen you want to modify, in this case SO301000. Using the screen editor, you'll be able to seamlessly add your desired data fields directly into the layout (column 2 is highlighted in the screenshot below along with one of our user defined fields).
By doing so, you can bypass the need to access the 'User Defined Fields' tab altogether. This approach offers a more streamlined solution, ensuring your user-defined field appears exactly where you want it within the Sales Order Header, without the extra step of navigating to a separate tab.
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