Yoast plugin bottom post page options unavailable after simplearticle theme update

After I uploaded the last version of the Simple Article theme the Yoast plugin doesn’t work properly. No option available at the bottom of the page post to improve the SEO and readability of the post. The issue depends on the theme because I checked every single plugin conflict and all of them
work fine. Likewise the Twenty Twenty theme doesn’t show this flaw when tested with Health Check & Troubleshooting plugin. Would you kindly give me any help and support? Thanks