apps tab give access to start process to all : how to remove that

in organization
i create 3 group

  1. user
  2. manager
  3. head

and in my process 3 lane

  1. initiator : actor - user group
  2. approval 1 : actor - manager
  3. approval 2 : actor - head group

but still users from “manager” and “head” group can see Process on portal and can start process .
what should i do
what i miss taken

I do mistake on mapping ,
thanks its done

apologize for waste your time