Nachtmahr and ING97 thanks for the answers. I imported exactly a 1m x 1m cube and then recalculate the proportions on Unreal. It worked, but not the way I wanted, hehe.
So I calculated the proportions on my external 3D software (Maya) and when I imported to Unreal as a FBX I used the option “Import Uniform Scale” and typed 200 as multiplier, that way the object imported would be on a normal size instead of being a mini object (another issue that I had previously).