how to make summary no md file in gitbook editor

[CleverCat123]

If we use gitbook editor, gitbook editor will automatically create a md file and link this file to the chapter if this chapter has no md file. This will change our summary file and create unwanted result. Sometimes, you want a chapter without link. this gives you structure like

chapter1
---article1
---article 2

but gitbook editor will make summary like

chapter 1 (chapter 1.md)
-----article 1
-----article 2