Problem with particule system

Hello devellopers,

I start on ureal engine and have a problem with the particle system.

When I create a particle system a window opens and my default particle is represented in 2d.
The problem is that in every tutorial I look at this default particle is 3d represent

I do not understand why at home he stays in 2d

I put pictures to better understand me

If anyone can help me I would be eternally grateful

Ps sorry for my english ^^