Why does an empty unity game weigh 40mb?

Question

Unity

If the guide, for example, I created an empty 2d project, the project itself weighs 150 mb, and the build folder is 40, only the unityplayer.dll file is 20y. I definitely saw ready-made projects of 5-10 mb each (ready-made, that is, with resources and a bunch of files). Is it my errors in the build settings or what?
And how to detect and remove a package that is not in use?