You have to tick the option "Show full accounting features" in the user settings.

From Odoo 13 and above, You can install invoicing module in Community Edition (CE). but Accounting addons is not available in CE. You can install third party apps available in Odoo App store but you need to mount a folder (Where you store the accounting app) from your host machine to the docker and you can do it as per below:

if you run odoo without docker-compose:

$ docker run -v /path/to/your/local/folder:/mnt/extra-addons -p 8069:8069 --name odoo --link db:db -t odoo

https://hub.docker.com/_/odoo

You can get accounting app for Odoo13 and above for CE:

https://apps.odoo.com/apps/modules/14.0/base_accounting_kit/

https://apps.odoo.com/apps/modules/13.0/om_account_accountant/