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I have a custom taxonomy which I want to behave in the same way that tags do on the post edit screen, instead of how categories appear. I have tried passing in the 'show_tagcloud' => true attribute, but it is still behaving like categories.
'show_tagcloud' => true
Pass this argument in register_taxonomy(),
'hierarchical' => false,
or use following links
How to Add Tags to Custom Post Type?
Adding post tags to custom post types
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