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② 後台搜尋「Cosmo Block Edit Mode for ACF」→ 直接安裝（推薦）
原文外掛簡介
Since the post editor canvas is always rendered inside an iframe, Advanced Custom Fields forces every ACF block into preview mode: the toolbar toggle disappears and the field form is pushed into the sidebar. There is no filter or setting to turn that behaviour off.
This plugin restores the previous experience. The toolbar toggle comes back and the fields are edited in place, inside the block, exactly where the content is.
Cosmo Block Edit Mode for ACF is an independent, unofficial plugin. “ACF” and “Advanced Custom Fields” are trademarks of WP Engine; this plugin is not affiliated with, endorsed by, or sponsored by WP Engine or the Advanced Custom Fields team, and the name refers to that plugin solely to describe what this one works with.
How it works
The plugin builds a patched copy of the ACF blocks script on the fly. The only change is one internal “is the editor iframed?” check, which is made to always return false. The copy is stored in wp-content/uploads/cosmo-block-edit-mode-for-acf/ and its file name is derived from the ACF version and the source file, so it is rebuilt automatically after every ACF update.
If a future ACF release rewrites that part of the code, the plugin silently serves the untouched original and shows a warning in the admin area. Your site never breaks – it simply falls back to the current ACF behaviour.
Some extra styling and a small companion script are loaded inside the canvas iframe, because the iframe does not inherit the wp-admin stylesheets that ACF fields depend on. These also fix everything that breaks once a field lives in a different document than the scripts driving it: select2 dropdowns, tooltip placement, and the WYSIWYG field – TinyMCE, Quicktags, the Visual/Text tabs and the Add Media button.
Requirements
This plugin requires ACF PRO, a commercial plugin sold separately by WP Engine and not distributed through WordPress.org. Blocks are a PRO-only feature. With ACF PRO inactive, this plugin does nothing at all.
This plugin is not affiliated with, endorsed by, or sponsored by WP Engine or the Advanced Custom Fields team.
Developers
Turn the patch off without deactivating the plugin:
add_filter( 'cosmo/block_edit_mode_for_acf/enabled', '__return_false' );
