If you modify a build configuration that the new project wizard generates, you can restore that configuration to its default state. You might want to restore the build properties in order to have a factory-default configuration, or to revert to a last-known working build configuration. To undo your modifications to build properties, click the Restore Defaults button at the bottom of the Properties window.
This changes the values of the options to the absolute default of the toolchain. By default, the toolchain options are blank.
For example, when a HCS08 project is created the Linker > Input panel has some values set for the Parameter File and Libraries options, which are specific to the project. Clicking the Restore Defaults button defaults the values of the Parameter File and Libraries options to the blank state of the toolchain.