Is it possible to change a primary image to format 16:9?

Hi @Smokey2024,

No this is not recommended per IMDb's primary poster formatting. The poster can be added to the title, but not adequately made primary as per our Image Guide FAQs:

For Film and TV posters, to minimize cropping, we recommend a vertical alignment (i.e. portrait orientation) with an aspect ratio of 1:0.675. For Podcast covers, to prevent cropping, we recommend a square (1:1) aspect ratio as is the industry standard for audio titles. We recommend always providing the highest quality image available.

Cheers!