That's the only option available on the phone or on the computer?
I do MTP transfers to my Pixel 2 (Android 11) regularly, so this isn't a limitation of the Pixel software. It has to be either that the phone is set in the wrong mode or there's something set up wrong on your PC (I don't use Windows, so can't help there). Have you tried going into Developer Options and setting the default USB configuration to "File transfer"?
If you don't know, Developer Options is in Settings > System > Advanced. Before you can access it you need to find the build number in your software information and tap on it repeatedly to unhide the developer options menu (Google used to just leave it visible, but decided - incorrectly - that it would be cute to hide it behind an easter egg a few years ago).