I fix the problem in 3 steps

first create a field x_user_id in model pos.config with details:

name:field x_user_id

type:many2one

relation of objet:res.users

2- Add this fields in pos.config form view

3- Create a rule name: POS assign with details

Name:POS assign

objet:pos.config

domain filter: [('x_user_id','=',user.id)]

add a security group ex:point of sale /users