Good afternoon, blender by default does not support the standard format of UE4 and UE5 skeletons, their display is probably similar to something like this. You probably need some addons or something similar, I don’t work in blender. You can try some free solutions like this https://youtu.be/CgqYlF45fcM
However, I advise you to look for information in the community about working with skeletal meshes on the Unreal skeleton, because problems may also arise when exporting animation from blender to UE.