Project settings
Project settings apply to the current project only. They are stored together with other project files in the .idea directory in the .xml format. For example, projects keep VCS settings, code style spellchecker settings, the list of language injections, and so on. These settings are placed under version control automatically together with your application code when you send it to your VCS.
To configure project settings, select for macOS (Ctrl+Alt+S) or for Windows and Linux.
In the Settings/Preferences dialog, settings that are marked with the 
icon apply only to the current project. Other settings are global and apply to all existing projects.
If you want to share project settings between already existing projects, you can use the Settings Repository or the Settings Sync plugin. You can also export the settings to a ZIP archive and import it later to other IDE instances.
For the detailed description of every option in the settings, refer to Settings / Preferences dialog.
Default settings for new projects
You can configure project settings not only for the current project, but for all projects that you will create later. This means that you can set the new default settings for your projects.
From the main menu, select .