* [View Release Post](https://www.advancedcustomfields.com/blog/acf-6-6-released/)
* New - ACF Blocks Version 3 supports WordPress Block API Version 3
* New - ACF now requires WordPress version 6.2 or newer
* Enhancement - Field Groups can now have a separate Display Title
* Enhancement - Accessibility improvements for button groups, checkbox, radio, and image field types
* Enhancement - Color Picker field can now use a custom palette or use theme.json colors as the palette
* Enhancement - ACF admin notices now use WordPress core styles again
* Enhancement - The Flexible Content “Delete Layout” and “Rename Layout” modals now display correctly on mobile
* Fix - Blocks V3: You can now edit ACF blocks in Edit mode inside WP Core's pattern editor
* Fix - Blocks V3: Validation errors now first appear after you click "Save/publish", as opposed to immediately, while you are typing into a field for the first time
* Fix - Blocks V3: After fixing a field validation error it shows as fixed immediately as opposed to needing to click out of the block and back into it
* Fix - Blocks V3: Blocks with radio buttons no longer affect each other's field values
* Fix - Blocks V3: Blocks with required radio buttons now validate correctly
* Fix - Blocks V3: ACF field validation now works in the Site Editor
* Fix - Blocks V3: WYSIWYG fields are no longer affected by typing into other blocks
* Fix - New field names are lowercase only
* Fix - Icon Picker now enforces required validation
* Fix - Calls to jQuery’s deprecated focus function have been updated to use the trigger function
* i18n - Updated PRO Japanese translations (props danielkun)
* Enhancement - The Flexible Content “Expand All” and “Collapse All” button now appear correctly on mobile
* Enhancement - The Flexible Content delete layout button is now back in the main layout header, making it easier to delete layouts
* Enhancement - The JSON import tool now limits the selectable files to JSON files
* Fix - Disabled Flexible Content layouts are no longer counted towards min/max layout validation
* Fix - The top “Add Row” button for layouts is now disabled when layouts have reached the max layouts validation
* Fix - The per-layout “Add Row” and “Duplicate Layout” buttons are now disabled when layouts have reached the max layouts validation
* Fix - Disabling Flexible Content layouts no longer disables layouts in cloned Flexible Content fields using a different post ID on the same page
* Fix - Flexible Content “Add Layout” menu is no longer hidden by some field types
* Fix - Flexible Content layout names can now allow some safe HTML
* Fix - When creating a temporary post type during import, ACF now correctly sets the ACF post type, rather than defaulting to post
* Fix - ACF PRO updates are now shown even when no other plugins have an update available
* Fix - Flexible Content layouts configured with a "Layout" setting of "Table" are now rendered correctly in the post editor
* Fix - Flexible Content "Add Layout" buttons now insert the new layout in the correct position
* Fix - Long Flexible Content layout names no longer extend outside of the "Add Layout" dropdown
* New - Flexible Content layouts can now be renamed in the post editor, giving content editors better clarity when managing layouts
* New - Flexible Content layouts can now be disabled, preventing them from rendering on the frontend without needing to delete their data
* New - Flexible Content layouts can now be collapsed and expanded in bulk for faster content editing
* New - Editing a Flexible Content layout now highlights the layout being edited, making it easier to identify
* New - The Date and Date Time Picker fields can now be configured to default to the current date
* Fix - Custom Icon Picker tabs now work correctly when used inside an ACF Block
* Fix - Duplicating a Field Group no longer causes a fatal error when using Russian translations
* Fix - ACF classes no longer use dynamic class properties, improving compatibility with PHP 8.2+
* Fix - ACF PRO no longer shows an update available immediately after updating to the latest version
* Fix - Field group metabox collapse and expand buttons are no longer misaligned in the post editor
* Fix - The ACF Site Health section no longer causes a PHP warning when field group location rules are incomplete
* Security - HTML is now escaped from field validation errors and tooltips
* Security - Unsafe HTML in field group labels is now correctly escaped for conditionally loaded field groups, resolving a JS execution vulnerability in the classic editor
* Security - HTML is now escaped from field group labels when output in the ACF admin
* Security - Bidirectional and Conditional Logic Select2 elements no longer render HTML in field labels or post titles
* Security - The `acf.escHtml` function now uses the third party DOMPurify library to ensure all unsafe HTML is removed. A new `esc_html_dompurify_config` JS filter can be used to modify the default behaviour
* Security - Post titles are now correctly escaped whenever they are output by ACF code. Thanks to Shogo Kumamaru of LAC Co., Ltd. for the responsible disclosure
* Security - An admin notice is now displayed when version 3 of the Select2 library is used, as it has now been deprecated in favor of version 4
* New - In ACF PRO, fields can now be added to WooCommerce Subscriptions when using HPOS
* Security - Changing a field type no longer enables the "Allow Access to Value in Editor UI" setting
* Fix - Paginated Repeater fields no longer save duplicate values when saving to a WooCommerce Order with HPOS disabled
* Fix - Blocks registered via acf_register_block_type() with a `parent` value of `null` no longer fail to register
* New - Select fields can now be configured to allow creating new options when editing the field's value (requires the "Stylized UI" and "Multiple" field settings to be enabled)
* Enhancement - The "Escaped HTML" warning notice [introduced in ACF 6.2.5](https://www.advancedcustomfields.com/blog/acf-6-2-5-security-release/) is now disabled by default
* Enhancement - The Icon Picker field now supports supplying an array of icons to a custom tab via a new `acf/fields/icon_picker/{tab_name}/icons` filter
* Fix - ACF Blocks are now forced into preview mode when editing a synced pattern
* Fix - The free ACF plugin once again works with the Classic Widgets plugin and the legacy ACF Options Page addon
* Fix - ACF no longer causes an infinite loop in bbPress when editing replies
* Fix - Calling `acf_get_reference()` with an invalid field name no longer causes a fatal error
* Enhancement - Error messages that occur when field validation fails due an insufficient security nonce now have additional context
* Fix - Duplicated ACF blocks no longer lose their field values after the initial save when block preloading is enabled
* Fix - ACF Blocks containing complex field types now behave correctly when React StrictMode is enabled
* Enhancement - Field Group keys are now copyable on click
* Fix - Repeater tables with fields hidden by conditional logic now render correctly
* Fix - ACF Blocks now behave correctly in React StrictMode
* Fix - Edit mode is no longer available to ACF Blocks with an WordPress Block API version of 3 as field editing is not supported in the iframe