Open the anim, check the appropriate checkbox for it to show. (As preview, to enable actually using it, set it in Details panel, more info in the link at the end)
Preview checkbox is under top panels inside anim preview viewport > Character > Animation > Process Root Motion. (This Character option is visible only in anim preview).
If the anim has root motion, it will start moving instead of running in place, and additionally, a red bone signifier will connect root of the scene and root of the character (see screenshot in the link below). Do note if you’ve opened a root motion anim and then an in-place one (a non-root-motion), the red bone will remain, but the character will be again moving in place.
https://docs.unrealengine.com/Images/Engine/Animation/RootMotion/RootMotionBone.webp
There’s more info on [Root Motion | Unreal Engine Documentation][3]
Cheers