The New Google Sites website builder can only show up to 5,000 pixels. Anything beyond this point will be truncated.
If you have lots of records with high volume of texts and images, we recommend using pagination to optimize your Table or Cards app. You can do this by specifying smaller values (for example, between 5 and 20) in the # of items displayed or # of rows field. You can learn more about this here.
Alternatively, you can use other CMS or website builders.