After you created all the necessary galleries, go to "Galleries" => "Global Settings" and switch to the "Cover" tab. There you can find "Galleries Page" option. Select the page where you would like to display all your existing galleries and click "Save Changes" button.
After that, you can go to the selected page and see all your galleries.
This article related to Galley by BestWebSoft plugin
Additional resources: Gallery - User Guide
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