Hi tv.turix,
We support excerpt content. So vimeo and youtube image is not displayed as it supports only plain text. You youtube and vimeo video will be displayed on the single page.
If you like to display it on front page then code customization is required. Goto theme folder -> inc -> structure -> content-extension.php on line no 113 and 140 you will find this code <?php the_excerpt(); ?> and replace it with <?php the_content(); ?>
Remember we recommended you not to change the code but if you change the code then create a child theme so that while updating to new version your customized code will not be lost.
Thank you
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