For example We have two category like : Q2Acore & plugins on q2a
If a user click Q2Acore then widget only visible on page "http://www.question2answer.org/qa/core" not on other page.
Is it posiible if yes , can i have some sort of help..
You would have to make a custom widget whose output_widget() function checks the $request parameter before deciding whether to be displayed or not.
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July 15, 2020: Q2A 1.8.5 released!