Here are the steps on how to view a desktop site on Mobile Safari:

Open the Settings app on your iPhone or iPad.
Tap on Safari.
Scroll down and tap on Request Desktop Site.
Toggle the switch to On.

Once you have enabled Request Desktop Site, any time you visit a website in Safari, it will be displayed in the desktop version of the site.

Here are some things to keep in mind when using Request Desktop Site:

Some websites may not display correctly in the desktop version. This is because the desktop version of the website is designed to be viewed on a larger screen.
Some websites may require you to disable Request Desktop Site in order to use certain features. For example, some websites require you to be logged in to use their mobile app.

If you are having trouble viewing a website in the desktop version, you can try clearing your browser’s cache and cookies. You can also try disabling Request Desktop Site and then enabling it again.