Thanks for the bug report. I don’t see this errors on any of my sites so my guess is that it’s because of a conflict with some other plugin. Can you disable all other plugins and see if it works then and/or can you post a list of your active plugins here so maybe I can take a look?
Same to us, selecting “show search options” produces no effect.
Console: Error: No select2/compat/initSelection
Our active plugins:
Adapta RGPD
Bizum WooCommerce
Bridge Core
Broken Link Checker
Carousel Slider
Checkout Manager for WooCommerce
Code Snippets
Contact Form 7
Contact Form 7 Multilingual
Enable Media Replace
Envato Market
EWWW Image Optimizer
Health Check & Troubleshooting
LayerSlider WP
Metricool
PixelYourSite
Popup Maker
Preview E-mails for WooCommerce
Product Feed PRO for WooCommerce
Redirection
Redsys WooCommerce
Regenerate Thumbnails
Simple History
Slider Revolution
UpdraftPlus – Backup/Restore
WooCommerce
WooCommerce Extended Coupon Features FREE
WooCommerce Multilingual
WooCommerce PDF Invoices & Packing Slips
Wordfence Security
WP-Optimize – Clean, Compress, Cache
WPBakery Page Builder
WPML Multilingual CMS
WPML String Translation
WPML Translation Management
Yoast SEO