Featured image don’t show in articles

Hello, I’ve just changed my WordPress theme from Envo Magazine to Typecore and I encounter a little issue with it : the featured image don’t show in my articles, I have it on the homepage, but when I go in my articles it doesn’t show up.
I’ve tried to change options and switch navigator and nothing work, is there anything I have to do to show them please ?
Here is a little list of my plugins if it helps :
– Akismet Anti-Spam
– All in One SEO Pack
– Alx Extensions
– Meta Box
– Classic Editor
– Jetpack by WordPress.com
– Loginizer
– Podcast Player
– Regenerate Thumbnails
– TinyMCE
– WP Fastest Cache
– WP-PageNavi

Thank you !!!

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