XF 2.2 how to remove the "master node" when sub-nodes ?

Solution
The page you linked is a "category node". The one on your site is a forum node. You'd need to create a category node and move all those nodes above into it.
The page you linked is a "category node". The one on your site is a forum node. You'd need to create a category node and move all those nodes above into it.
 
Solution
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