If you have a fieldgroup in a node, you may want to hide it on some conditions. Here's how to do that programmatically. At first, we need to preprocess our node like this:

1. /**
2. * Implements hook_preprocess_HOOK().
3. */
4. function MODULE_NAME_preprocess_node(&$variables) {
5. }

The tricky part starts here, if you'll google for "hide a ...

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