Hi,

If you just need to see the selected employee in the email groups model, in the email groups form view, what you can do is that, add a many2many field with co model as hr.employee as follows:

Assuming the added many2many field in the hr.employee model is as follows,

x_group = fields.Many2many('x_egroup', 'relation_table_name', 'rel_1', 'rel_2', string='Email Group')

Then add an another many2many in the model x_egroup model as follows,

employee_ids = fields.Many2many('hr.employee', 'relation_table_name', 'rel_2', 'rel_1', string='Employees')

Just swap the rel_1 and rel_2, this will work for you.

Reference:

1. Working of Many2many fields in Odoo

2. Odoo Guidelines

Thanks