Hi amircn,
Thanks for your patience.
1. Please add the following Custom CSS code to Theme Settings > Custom CSS > Global Custom CSS:
body.blog .wd-meta-date,
body.blog .blog-design-meta-image .wd-post-cat:not(:last-child):after{
display: none;
}
2. There are 2 things:
+ Resize: I kindly recommend you preparing images you want before uploading them to your media library using the graphic editor (Photoshop or any other) to have a nice-looking grid.
+ Remove: Just simply remove Featured Image https://prnt.sc/duk2SrpeZ_Po
3. Main Widget Area is used for Blog page, you can add few widgets to it to see the changes.
Regards,