question about depth of field

hi! i have trouble with camera’s depth of field. my plan is for when i aim, it will blur out the character. i notice that particles are not affected by it. i was wondering what are the ways i can do to fix this. also i notice theres a “barrier shape” on the character along with the field. but maybe its just relating to the partciles not being blurred out.

just an update. i wanted to post in discord same question here. so i decided to do screenshot so that its faster. i was wondering if anyone have a sollution for this?