The articles can only sort by in the same category. You can use option " Category Order" and "Article Order" to sort them.
Thanks & regard
Sharing your current location while posting a new question allow viewers to identify the location you are located.
TZ Portfolio is a really good portfolio developing extensions for Joomla that allows users to display, style and manage their portfolio easily.
Plus it has all layouts and multi-categories you would need for a portfolio with two basic views: Portfolio and Single Article view.
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