That’s how it works. When you drag a widget into a sidebar, it’s there. There’s no save. There’s only a save if you open the widget and modify its settings.
Firstly thanks for your answer.
When I drag widgets widget area doesn’t appear it’s settings.
Only after “refresh” appear settings.
There’s probably an arrow to open the settings.
See https://i.imgur.com/YIjIgKf.png

Yes, when you go to the Appearance > Widgets page it will save things automatically.
This is one of the few reasons I like using the Customizer. It allows you to preview things without affecting what people see on the live site until you press the Publish button.
