I have an entity called application whose form users can use to fill their application for a course they want to avail.
I have added the form to a power page portal

However in the form there is a lookup field called applicant which is a lookup field from Leads table
Now when i open the form in crm im getting list of all leads to choose from when i select the applicant field in the form .

However, when I check the power page portal and select the applicant field in the portal form It does not show all the leads and only shows those leads in the list for which application is already created.
No matter what view I use and also I have given all permission as well for the child attributes, I am still getting only those leads in the list for which application is already created.

So i wanted to know what can be a viable solution that I can try to resolve this.