I’ve just used the unity, I want to use the visual script but nothing appears and the tool button above does not exist why?
Sorry but your question is not clear. So I’m not sure what you’re asking here. Unity does not include any visual scripting tools (unless you mean mecanim which isn’t really a scripting tool). There are countless visual scripting solutions for Unity like Bolt, uScript, Antares and Playmaker just to name a few off the top of my head.
Anyways, any of those need to be imported into your project in order to use it, some of them need to be purchased first. Unity itself doesn’t have a “Tools” menu item. However many editor extensions (my own ones as well) often create menu items inside the Tools menu. Though as i said if you don’t have imported those extensions into your project it won’t be there.