Thank you for posting your inquiry here in Microsoft Community, Alexandria_922.
I'm sorry to hear that your Print stopped printing documents using the surface Go. I will do my best to assist.
May I confirm the make and model of your Brothers printer? Did the issue start when you switched the device to S-mode?
If the issue started after switching to S-mode, I suggest to check the Brothers Printer website and check for the driver that is compatible for devices running an S-Mode Operating System.
Please check the article: Windows 10 and Windows 11 in S mode FAQ
The S-mode operating system gives limitations on drivers for hardware (like printers and etc.)