Image size setting for blog does not work

Hi there!

Sorry for the inconvenience.

You may use the following code in your custom CSS to get same size image there:

article.item .entry-image a img {
    height: 400px;
}

Note: Path towards custom CSS(Joomla 3): Extensions>Templates>Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.

Best Regards