> The "package manager" (https://tilepieces.net/documentation/panels/package-manager....) is not only used for projects, but also to create / load / export components (https://tilepieces.net/documentation/data-structures/compone...), and to set the global properties of the application.

Is there a reason to have that functionality exist in the same view? It feels like the benefit of a window ("panel") based UI is that you can dedicate each group of functions to one window and not need to combine different jobs into the same panel.