thumbnail size cropped

Hi, i followed this steps: https://www.ads-software.com/support/topic/featured-images-being-cropped?replies=11 and nothing changes. Please help.

already changed this with/without ‘true’
// Thumbnail sizes
add_image_size( ‘thumb-small’, 75, 75, true );
add_image_size( ‘thumb-medium’, 327, 435, true );
add_image_size( ‘thumb-large’, 720, 560, true );

as shown on the page still cropped at default theme size.
https://akosijuan.com/sikat/

my media setting:
Thumbnail size 75×75
Medium size 327×435
Large size 720×680