There are a few different ways to change the size of images on a WordPress site:
1. Use the image editor: When you upload an image to WordPress, you can use the built-in image editor to crop or resize the image.
1. Change the image settings: In the Media Library, you can select an image and click on the “Edit Image” button to change its settings. From here, you can adjust the size, crop the image, and even change the file type.
1. Use a plugin: There are many plugins available for WordPress that allow you to resize images, such as WP Smush and EWWW Image Optimizer.
1. Edit your theme’s CSS: If you have a little bit of coding knowledge, you can adjust the size of images by editing your theme’s CSS.