Hi, i am creating a virtual showroom for a university project and i would like to add a “floating menu” near the dresses, to edit them. I already have all the dresses and i learned how to change the material of them, but i cant find on internet any info or something that can lead me to achieve the …

Then it sounds like you need a widget component: which is 'in the world' For the ‘arm’, it’s probably best to use a beam particle system: [Unreal Engine 4 Tutorial - Laser Beam Tutorial]