Usually when I edit my articles, I find it opened in advanced editor. But when I click on the “Switch to Guided Editor”, it loads the page and again the same (advanced) editor opens. This happens mostly for my own articles. I have not written any ForceADV thing in the bottom. Thanks! RG

If there are multiple methods, it will automatically open in Advanced Editor, regardless of the setting you have set in your preferences. It is not currently possible to edit multiple methods/parts in Guided Editing.

Then what shall I do to categorize the article?

Add [[Category: categoryname ]] just below the introduction.

OK OK Got you @Alabaster and @SudoKing