The Default Settings rule is a special kind of rule assigned to those windows that don't have a corresponding Specific Settings rule or Exclusion rule. In other words, the Default Settings rule defines the default set of Actual Tools program's features. Here you can add the default set of title buttons that will be available to every window, extend every window's system menu with handy commands, adjust the default options of minimization, rolling up and closing characteristics, and tweak many other options to suit your needs.
Note that some options have been purposely excluded from Default Settings processing when they would be meaningless or possibly problematic for any window. There are, for example, certain windows with no title bar and windows that cannot be minimized or resized, and it would be pointless to specify window positioning or size for such arbitrary window. For this reason, the full range of options is available via the Specific Settings rules only.
In addition, some system or service windows should be left unhandled by Actual Tools programs. Such windows do their work in the background and therefore do not present themselves for user interaction, so these windows should be excluded to avoid problems that might otherwise arise if you tried to alter their properties or interfere in their behavior.
Important note! Since the version 8.2, when you change some option in the Default Settings rule, the change propagates automatically to all available Specific Settings rules. This helps to keep the entire window settings configuration in consistent and expected state. Note that change to a certain specific rule is made only in case that the changed option's value in this rule is the same as in the Default Settings rule; otherwise, it remains untouched. This, on the other hand, allows to make specific rules differ from the default one in some options.