Hello, @Saira,
You can make them the design a rectangle and the corners curved using the Custom CSS, Please copy and paste the below-given CSS code to XStore >> Theme Settings >> Theme Custom CSS >> Global Custom CSS.
.category-grid img {
height: 200px !important;
width: 300px !important;
border-radius: 30px !important;
}
Note: You can change the values in the given Code as per your requirements.
Regards 8Themes Team.
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