With Genesis 3.3.4, StudioPress has implemented support for the new block-based widget editor. The new widget editor has been added with WordPress version 5.8.
But to use the function you have to add the following code in functions.php:
//* Enable the block-based widget editor
add_filter( 'use_widgets_block_editor', '__return_true' );More information can be found here: https://my.studiopress.com/documentation/snippets/block-editor/enable-block-based-widget-editor/ (english)