React-admin ImageField высота / ширина

Разобрался в этом. Просто делал это неправильно:

const styles = {
  image: { maxHeight: '3rem' }
}

export const UserList = withStyles(styles)(({ classes, permissions, ...props }) => (
  <List actions = {<UserListActions />} sort = {{ field: 'lastName', order: 'ASC' }} title = "All users" {...props} bulkActions = {false}>
    <Datagrid>
      <ImageField classes = {classes} source = "imageUrl" label = "Profile Picture" />

Это тоже работает:

import { makeStyles } from '@material-ui/core/styles';

const useImageFieldStyles = makeStyles(theme => ({
    image: { // This will override the style of the <img> inside the <div>
        width: 50,
        height: 50,
    }
}));

const PostEdit = ({ permissions, ...props }) => {
    const imageFieldClasses = useImageFieldStyles();
    return (
        // ...
        <ImageInput multiple source = "pictures" accept = "image/*">
            <ImageField classes = {imageFieldClasses} source = "src" title = "title" />
        </ImageInput>
        // ...
    );
};

Из: https://github.com/marmelab/react-admin/issues/3106#issuecomment-658752706