In my blender it shows like that
i want it like that
The option is on the subdivision modifier itself.
it only have 4 vertices but in video dude has more. This is the video https://www.youtube.com/watch?v=sEbp5UCP288
The image has more vertices because the artist has modified the object and added extra edge loops. Is this what you mean? If you don’t know how to add edge loops, you should watch videos about beginner modeling in Blender.
If you mean how to make the surface look smooth and reflective, you have to first set the object to “shade smooth”. You can do that by selecting it in object mode and right clicking, the option “shade smooth” will be there.
Also, this image is using a matcap.
no i know subdivision. But in video he applied subdivision modifier thats what i missed