These options are stored in Cinema 4D's preference files and they are synchronized in all scenes.

Default Production Engine/Default Interactive Engine
Allows you to setup the default engine in each mode. Keep in mind that Unbiased (TR1/TR2) and Adaptive BSD engines are not available in Interactive Mode.

Default Material Room
Specifies the default material preview room that will be used in every newly Thea material.

Auto Refresh Material
Allows the material to refresh its preview every time a parameter is changed. The Refresh operation might take some time to generate, depending of course on the material’s complexity.

Default Export Extension
Sets the default extension in Thea Render > Export command.