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I forgot to post MAIN and Structure files.

Main file is shown below.

%%%
% Compiling this template:
% This template uses biber for its bibliography and makeindex for its index.
% When you first open the template, compile it from the command line with the
% commands below to make sure your LaTeX ...

I try to edit Legrand Orange Book for using THAI language many ways.
it has not worked correctly.
I guess FONT is a problem. I try to fix it but it has still not worked.

For the file "Main - How it works'',
Green box = it is good.
Red box = it is not good. It has not worked.

Has anybody an idea ...