Hey Saswata,
To hide the Read More button, please add this code in Theme Options > CSS.
.more-link {
display: none;
}
The size of the thumbnail could not be edited using CSS. It would need overriding the x_featured_image
which can be found in featured.php located in framework\functions\frontend folder of the theme. To override the function, just copy it to the functions.php of your child theme.
Please just note that we do not offer support for issues that result from customizations. For that, you’d need to consult with a third-party developer.
For a non-coding alternative, you can alternatively try using one of the bundled grid plugins as they have lots of post display options. Please visit the links below for more information:
If you have more questions, feel free to open separate threads for each. The reason why we recommend one issue per thread is so one support staff could focus on one issue at a time. Mixing topics in a thread also often result to confusion.
Hope that helps.