Some of the default Modern apps, like Xbox and Weather, are useful to some people but not others. Others, like Candy Crush Saga, are junk you should remove.

Is it safe to remove Xbox from Windows 10?

To uninstall XBox, you will have to use Powershell as Windows Apps & features will not allow you to uninstall default applications. But to create space on your computer, I will suggest following as only removal of Xbox and some applications may not give you sufficient amount of space.

Should I uninstall Xbox console companion?

If you are into gaming, make sure not to uninstall Xbox Console Companion app. It offers features like Game Bar, Live streaming and comes with Xbox Live integration.