please specify the odoo version and hosting?
to improve the quality of the answers you can add this in the Tags, e.g. for version 16 Community, v16ce
If you are using Odoo community you need to enable "Full accounting features" to see the journal field in invoices.

Thanks Ricardo, It works.

What was missing is to enable the full accounting feature.

What I did:
- Setting / User and companies
- Select Groups
- Search for "full accounting"
- Add my users to the group "Show Full accounting features".
Logout / login.

Thanks Ricardo for your help.