When you’re doing Flutter Desktop apps, one severe limitation could be the fact that “it all runs in one window.” I didn’t do that much, but I realized the limitations when I found this article.
However, <a href="https://medium.com/@alexsinelnikov?source=post_page---byline--21f5f9281c7b--------------------------------" target="_blank" rel="noopener nofollow">Alex Sinelnikov</a> does a good job explaining how he overcame the issue and succeeded in showing multiple “top-windows” that allow desktop flexibility, e.g., allowing your users to put your app’s windows on multiple desktops.
I already bookmarked the <a href="https://medium.com/@alexsinelnikov/multi-window-support-with-flutter-desktop-21f5f9281c7b" target="_blank" rel="noopener nofollow">“Multi-window support with flutter desktop” article</a>; I advise you to do the same, just in case.

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Flutter Developers

Flutter Desktop apps typically run in a single window, but Alex Sinelnikov provides a guide on how to achieve multi-window support. This feature allows users to have more flexibility, like placing application windows on multiple desktops.

Multi-Top-Window Support for Flutter Desktop Apps