Hi medmars,

You have a few options. You can add a database filter in order to only show the databases you'd like with the following option:

db_filter=REGEXP

For more information about the db_filter have a look at the documentation at https://www.odoo.com/documentation/11.0/setup/deploy.html#dbfilter

Alternatively you can set the list_db parameter to false - by doing this no databases will be listed or shown:

list_db=False

There is some limited documentation of this at https://www.odoo.com/documentation/11.0/setup/deploy.html#database-manager-security

You can find all server parameters and configuration options by running your Odoo-bin file with --help in order to output all options:

./odoo-bin --help

It will output all options, which you can find on Github at https://github.com/odoo/odoo/blob/cab7e0d204761a6249d67b4bb6e4b7ab6acb6e2b/odoo/tools/config.py#L102

Regards,
Yenthe

<odoo>
    <data>
        <template id="new_login_layout" inherit_id="web.login_layout" name="Login Layout Inherit">

            <xpath expr="//div[@class='col-md-6 col-md-offset-3 o_database_list']" position="before">
                <t t-set="disable_database_manager" t-value="1"/>
            </xpath>

           </template>

    </data>
</odoo>