here is the scenario : 

I have 4 companies (multi company enabled)

Company A posts a job in "Recruitment" and is reflected on the Jobs Portal. 

Company B,C,D posts jobs in "Recruitment" and is not reflected on the Job Portal. 

When modify Record Rules--->Job Multi company rule

and add in the "Group Name" : User Type / Public all jobs posted by the companies are visible on the Job Portal.

BUT 

at that moment all 4 companies can see the posted jobs under "Recruitment" 

What I want to do is : 

• Any job posted under "Recruitment" from any company is to be visible on the Job Portal. 
• No company should see other companies posted jobs under "Recruitment"

PS: each Recruiter of the 3 companies has access to only his company. Also using odoo 15 community