My sewing room gets messy when I am working on projects. I usually close the door so I don't have to look at it or keep pesky Kola off my work. But if it starts creeping into the hall then I clean.
Rule of thumb, the moment you step into your sewing room, area or cubby. Somebody is in desperate need of something "only you can find or do".
Other than gagging them, taping them to the sofa or nailing the door shut to your sewing area, we have to live with it.