There are two different kinds of options: Document options and General options. One big advantage of MetaTexis is that the document options are saved within the document concerned. Therefore, a document can be easily transferred to another computer without losing any information.
The settings made in the General options dialog box are saved on the computer you are working with, and they generally apply.
You can apply the following rule of thumb when you are looking for a special setting: If a setting refers to the character of a document, it can be found in the Document options dialog box.