Height of wysiwg is hardcoded in wysiwyg.php
Path\wp-content\plugins\advanced-custom-fields-pro\fields\wysiwyg.php:
255
256 // get height
257: $height = acf_get_user_setting('wysiwyg_height', 300);
258: $height = max( $height, 300 ); // minimum height is 300
You can’t easily change that with css because it produces inline css , viz –
<textarea id="acf-editor-gtg6gtg6gtg62" class="wp-editor-area" name="acf[field_gtg6gtg6gtg62]" style="height:300px;">wysiwyg content here</textarea>
Good thing is that wysiwyg.php looks like its primed to go for adding wysiwyg height via admin interface.
