Hi jbootland,
Welcome to post in Microsoft Community. I'm Mosken, let me help you figure it out.
According to your description, I knew that you want to disable Microsoft Feeds and Xbox related apps. Is that right?
First of all about Microsoft Feeds, you can turn off Microsoft Feeds by following the steps below. Right click on the taskbar > "News and interests" > "Turn off". As shown below.

Or try disabling Microsoft Feeds in the registry using the command below. Please run Command Prompt as an administrator ("Win" logo key + "Q", enter "cmd", select "Run as administrator"), and enter the following commands one by one.
reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Windows Feeds" /v EnableFeeds /t REG_DWORD /d 0
Then you can try to uninstall Xbox related apps using the command below. Please run Power Shell as an administrator ("Win" logo key + "Q", enter "Power Shell ", select "Run as administrator"), and enter the following command. Then restart system.
get-appxpackage *Xbox* | remove-Appxpackage
The above steps are provided based on the information I have learned so far, I wish that will be helpful to you. If your problem still cannot be solved by these steps, you could tell me the specific situation in the next reply. I will continue to assist you in solving the problem.
Best Regards,
Mosken- MSFT | Microsoft Community Support Specialist