size of thumbnails or cover

Hi,

You can do that with custom CSS.

Please follow this article section:
https://dearflip.com/docs/dearflip-wordpress/issues-and-faqs/#how-to-change-thumb-size-for-lightbox-popups

Yes. Worked for size 240X360. But if i increase the size a bit more (250X375) does not change anything or images streched

Image will stretch to fit the provided size.
Auto fit – Image mode is available in Full version.
https://dearflip.com/flipbook-examples/