As I'm stuck with Opera 12.xx because of some basic function that's still missing from Opera 28.0.1750.40.
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Opera Bookmark in version 28.0.1750.40, there are no automatic sort, I can found manual sort but it's take to much time to do that.
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Opera Bookmark in version 28.0.1750.40, there are no Explore style like in Version 12.xx, I mean there are no bullet (plus icon) in the left side to expand and show sub-folder for easily access to bookmarks in sub-folde.
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Save as MHTML in basic options not by opera://flags/#save-page-as-mhtml