Change size of preview images

Add this code to the Custom CSS field on the Appearance tab of your File Embed widget’s settings:

.global-styles,
:root {
--eas-image-size: 100px;
}

.eapp-file-embed-grid-item {
width: auto !important;
min-width: var(--eas-image-size);
flex: 0 0 var(--eas-image-size);
}

.eapp-file-embed-icon-image {
max-width: var(--eas-image-size);
max-height: var(--eas-image-size);
}