featured image in blog

Dear SiteOrigin

What is the optimal graphic size & dimensions (i.e. h x w) in pixels for the featured image in blogs to ensure that the featured image does not get:

1. Displays correctly (i.e. full width as in corp theme demo) when in “Offset layout” https://zafafplanner.com/blog/

2. Displays untruncated when featured image is displayed in Alternate blog layout;

3. Displays truncated image when displays related blogs https://zafafplanner.com/%d8%b5%d8%b1%d8%a7%d8%b9-%d8%a7%d9%84%d8%ad%d8%a8/

Appreciate your help.

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