Disabling linux user password prompts when accessing encrypted drives (polkit conf?)

Question

I just created a new ext4 partition on a new drive and decided to use LUKS to encrypt it. I entered a password to use for encryption and the partition was created. So far, so good.

However, I have the drive open in Nautilus. Every time I move away from that window and come back to it, it asks me my user password (not the encryption password, but the password of my user on the local linux machine).

My expectation was that I would have to provide the encryption password once - when mounting the disk - and never again, and in particular, never have to provide linux user credentials to access the drive.

What I'm seeing would perhaps make sense in a military network, but is ridiculous in a home environment. How do I disable all password prompts beyond the first prompt for the encryption password?

This is Ubuntu 18.04.6 LTS, used gnome-disks to manage partitions. The drive is an external USB drive. I mounted it like any external memory, using Nautilus. I did not touch /etc/fstab, but I wouldn't expect I that I should touch it any more than I would for a USB key. The drive is accessible under /media/<myusername>/<external drive name>. The permissions on /media/<myusername> are drwx------ and it belongs to my user and my group.

Apparently, this behaviour is controlled by Polkit. I get the impression that I need to change ResultActive or ResultInactive in the encryption-related section to one of yes, no, auth_self, auth_self_keep. The docs are here, but I don't see where these terms are defined, in particular active and inactive and it doesn't help that the docs are not searchable. Any hints?

This article provides a great overview of allowed params and values, shedding some more light on the subject, but still no luck. I tried with /etc/polkit-1/localauthority/50-local.d/10-unlock.pkla:

[Test]
Identity=unix-user:*
Action=org.freedesktop.udisks.filesystem-*;org.freedesktop.udisks.drive-ata-smart*;org.freedesktop.udisks2.filesystem-mount-system;org.freedesktop.udisks2.encrypted-unlock-system;org.freedesktop.udisks2.filesystem-fstab;
ResultAny=yes