试着添加这样的CSS:

@page {
  size: landscape;
}

引用自css - discussion Wiki

The @page rule has been cut down in scope from CSS2 to CSS2.1. The full CSS2 @page rule was reportedly implemented only in Opera (and buggily even then). My own testing shows that IE and Firefox don't support @page at all. According to the now-obsolescent CSS2 spec section 13.2.2 it is possible to override the user's setting of orientation and (for example) force printing in Landscape but the relevant "size" property has been dropped from CSS2.1, consistent with the fact that no current browser supports it. It has been reinstated in the CSS3 Paged Media module but note that this is only a Working Draft (as at July 2009). Conclusion: forget about @page for the present. If you feel your document needs to be printed in Landscape orientation, ask yourself if you can instead make your design more fluid. If you really can't (perhaps because the document contains data tables with many columns, for example), you will need to advise the user to set the orientation to Landscape and perhaps outline how to do it in the most common browsers. Of course, some browsers have a print fit-to-width (shrink-to-fit) feature (e.g. Opera, Firefox, IE7) but it's inadvisable to rely on users having this facility or having it switched on.

-webkit-transform: rotate(-90deg); -moz-transform:rotate(-90deg);
     filter:progid:DXImageTransform.Microsoft.BasicImage(rotation=3);

在Firefox 16.0.2中不能运行，但在Chrome中可以运行

这对我也很管用:

@media print and (orientation:landscape) { … }

如果你正在使用React和MUI这样的库，在React应用中使用纯CSS并不是一个好的做法。更好的方法是使用一个名为GlobalStyles的样式组件，我们可以从Material UI导入它。 代码是这样的，

import { GlobalStyles } from '@mui/material';
const printStyle = {
  ['@media print']: {
    ['@page']: {
      size: 'landscape',
      margin: '2px',
     },
   },
 };

您可能不需要在@media打印中使用@page，因为@page仅用于打印。文档

页边距将消除浏览器在打印时生成的url。

我们可以在App容器中使用GlobalStyles。像这样

const App: React.FC = () => (
  <>
     <GlobalStyles styles={printStyle} />
     <AppView />
  </>
 );

当我们调用windows.print()时，它将应用上述CSS。 如果你在使用MUI之外的其他库，应该有一些组件或插件可以用于全局应用CSS。

<style type="text/css" media="print">
.landscape { 
    width: 100%; 
    height: 100%; 
    margin: 0% 0% 0% 0%; filter: progid:DXImageTransform.Microsoft.BasicImage(Rotation=1); 
} 
</style>

如果你想把这个样式应用到一个表格上，那么就用这个样式类创建一个div标签，并在这个div标签中添加table标签，最后关闭div标签。

此表格将仅以横向模式打印，所有其他页面将仅以纵向模式打印。但问题是，如果表的大小大于页面宽度，那么我们可能会丢失一些行，有时也会丢失标题。小心些而已。

祝你有愉快的一天。

谢谢你,亲爱的 Naveen Mettapally。