can't open the %-off icon on the right

You can try to uninstall and reinstall your profile onto your console as well as clear the MAC address, you can do this by going to your settings > network settings > advanced settings > alternate MAC address > clear, then try it again.

Right-click on the icon, open the application settings, uninstall, can be completely deleted.

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The instructions provided in the link you shared are generally correct for removing the Xbox app icon from the taskbar in Windows 10. Here is a summary of the steps:

Right-click on the Xbox app icon in the taskbar and select "Unpin from taskbar". This will remove the icon from the taskbar.

Open the Xbox app from the Start menu or the Windows Store.

Click on the gear icon in the upper-right corner of the app to open the settings.

In the settings, toggle off the "Show me as playing" option.

Close the Xbox app.

These steps should remove the Xbox app icon from the taskbar and prevent it from reappearing. However, please keep in mind that by disabling the 'show me as playing' feature will prevent your friends from seeing what games you are currently playing or when you were last active.

Open the Microsoft store app.

Hit the 3 dot's next to you icon. (top right)

Select my library, the game should be there.

Check if there is a "flashing icon" in the top left/right of your screen. That's a "autosave icon". I believe the game warned you that NFSTR uses autosave and that you must wait for it to finish before shutting off the game.