Hello Đỗ Phương Nam,

You can grant user permission with UI after activating Developer
Please check below steps for the same

1. Go to Settings > Users & Companies > Users.
2. Edit the Access Rights and ensure Read access is granted for the Employee model.

To create custom user groups in Odoo for more precise access management:

1. Navigate to Settings > Users & Companies > Groups to create and manage these groups.
2. Under the Technical section, in Security, click on Access Rights.
3. Locate and select the user or custom user group (e.g., "Employees") for configuring access rights.

To grant read access without creating a custom group:

1. Go to Settings > Users & Companies > Groups.
2. Find and select the appropriate group or user (e.g., "Employees") to configure access rights.
3. Under the Technical Settings section, click on Access Rights.
4. Locate the Employee model and ensure Read access is enabled.

I hope this will help you !

Thanks,
Vimal Rughani (Founder and CTO)
Himanjali Intelligent Automation Pvt Ltd
Contact: +91- 972-606-7737
Email: hello@himanjali.com 
Newsletter: The Odoo Scoop
Website: www.himanjali.co