How do I cleanup the mess of old versions on truenas?

I have a mess of old versions that I would like to clean up, how would I go about doing it?

In the web GUI: System → Boot → Boot Environments

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Geez, and I wanted to say to read the user guide.

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The user guide is massive. I didn’t find it there. I did search for it before asking.
For example, you would note that the word GRUB never appears in the page you link. GRUB only gets mentioned in printview and virtualization pages.

Sometimes you search for the wrong terms and don’t find the answer

I can see it from your perspective. You did not know it was a boot environment.

Even though the user guide is quite extensive, I still recommend surfing through it just to expose yourself to the GUI settings. Some are more important than others of course. I have to search that user guide myself periodically. I most certainly do not remember it all. If I did, I’d like to go to Vegas and play some cards.