Display meta box on front end

Use this code

$schema_group = rwmb_meta( 'schema_group' );
$schema_knvb = isset( $schema_group['schema_knvb'] ) ? $schema_group['schema_knvb'] : '';
echo $schema_knvb;

for more detail check the “Meta Box Group” page on the plugin documentation https://metabox.io/docs/meta-box-group/#section-how-to-get-meta-value-of-a-sub-field

Related Posts:

  1. Starting with tabbed metabox
  2. How to HIDE everything in PUBLISH metabox except Move to Trash & PUBLISH button
  3. Removing panels (meta boxes) in the Block Editor
  4. WordPress SEO by Yoast: Hide Meta Boxes in Posts for Non-admins
  5. How can I create a taxonomy meta-box with search suggestions but no new terms input?
  6. How to Add Reminders/Notes to New Post Meta Boxes
  7. How to reorder meta box position?
  8. How do I position meta_box on post edit screen after the title?
  9. Put the media uploader in a metabox
  10. Custom Meta Boxes: multiple fields within a repeatable field
  11. Metabox date month number to word
  12. get registered metaboxes by post type or post ID
  13. Remove metabox from specific page template in admin
  14. Is there a filter/action to add content to WP admin metaboxes?
  15. Attach Files Metabox
  16. How do I create a meta box for dates?
  17. Add a meta description to home page?
  18. How to insert Gallery shortcode to a meta box
  19. How to List all Sidebars in a Metabox
  20. Set height of the categories meta box in post dashboard
  21. Add template meta box to category edit page?
  22. Get image captions for images on gallery post format metabox
  23. How do I migrate meta boxes from the Classic Editor to the “side area” in Gutenberg Editor?
  24. Adding Metaboxes – so much code is there a shorter DRY way?
  25. Consolidate Metaboxes into 1 Big Metabox
  26. I need a Simple image uploader with a simple screen. WP default has too many options.
  27. Show or hide custom meta box not work with Gutenberg
  28. TinyMCE with custom buttons on a meta box
  29. How do i hide the auto-generated custom field that’s created when update_post_meta() is called?
  30. Set the default value as checked for a meta box checkbox
  31. How to search by metadata using REST API
  32. Display oembed in repeatable metaboxs using CMB2
  33. Automatically add a tag according to custom metadata
  34. How to add categories to page editor?
  35. Having trouble getting my meta data to save
  36. Undefined ‘post_type’ error on Add new page
  37. metabox wordpress show in frontend
  38. How to use get_post_custom function on the blog page?
  39. Multiplicate entry on update_post_meta
  40. Populate meta select box with child pages
  41. Problem with meta box in Links
  42. Post Meta not saving when have empty post
  43. Creating an “admin only” meta box with WPAlchemy. Getting a fatal error on front-end when using current_user_can
  44. How to modify Publish metabox?
  45. Multiple Meta Boxes in separate files
  46. Hide Polylang metabox from the post edit sidebar
  47. Meta box html is not updating after saving
  48. Controlling Meta Box Height
  49. Custom Meta box only returns most recent value on page
  50. Stop saving process when metabox is invalid [duplicate]
  51. how can i do metabox [closed]
  52. How to add meta box for image upload using WordPress media uploader?
  53. why add_menu_page use simple function as arg while add_meta_box a call back?
  54. List all sidebars in metabox
  55. Output from Meta Box Array
  56. Have mu-plugin remove meta box ONLY if it isn’t already removed in functions.php
  57. How to show the value of specific key from nested array?
  58. Getting metabox value?
  59. Hide Page Title with Post Meta
  60. Cannot remove meta box added through OOP
  61. Meta box does not save or update
  62. Show button if meta box has content, else hide
  63. Post Excerpt field only showing for default administrator
  64. Save JSON object attributes to custom metabox
  65. Is ‘repeatable’ a field type for meta boxes?
  66. Checkbox in post not saving value
  67. Custom loop attached to link
  68. post meta – problem : copy the same meta for all the articles
  69. Metaboxes inside Tab
  70. ACF – Hiding metaboxes through screen settings doesn’t work
  71. Remove Username and just show Name in Author Metabox in backend
  72. how can I make this metabox area
  73. Metabox not saving values
  74. Update Post Meta in Front End with a form
  75. get_post_meta not working on my custom-function page
  76. Metabox with checkbox is not working true!
  77. Featured Gallery to custom post type
  78. Displaying a Metabox linked to post settings for all users
  79. Can’t get meta values to save
  80. Unable to save multiple images in wordpress
  81. Custom WP Meta Box – Use data from within the post screen inside meta box
  82. How to show select_advanced content instead of ID?
  83. Removing Meta Generator
  84. Error when adding Meta Boxes, but only when adding 3 with the same callback
  85. Custom meta box using OOP way doesn’t save data
  86. A correct hook for saving meta boxes data
  87. update_post_meta does not work
  88. Hooking into the Meta Boxes (Name/Web Address/Description) on the ‘Add New Link’ Page
  89. show title if one of post meta exist
  90. Query a Custom Post Type to another CPT via Metabox
  91. when saveing $meta_box i get Undefined index error
  92. Adding a Custom ‘Now’ button under ‘Published on’ header to return current date and time
  93. Adding meta boxes to custom post type
  94. Meta boxes not showing up
  95. Custom metabox with App Store / Google Play links
  96. Metaboxes not saving data
  97. How do I create a Meta box that can be repeated? (with an image section and text area)
  98. Need help, Passing variables with get_post_meta
  99. Input select option Change Content in Metabox
  100. Is there a way to remove the Add boxes from the Screen Options menu metabox?