Full disk encryption on Dell Precision 3561 with Ubuntu 20.04?

I just received my Dell Precision 3561 with Ubuntu 20.04. It is not clear from the startup screen to apply full disk encryption. I know other Linux distributions like Pop! OS allow users to apply full disk encryption when setting up the computer. I was expecting a similar experience, knowing that Dell has been offering Ubuntu on their laptops for quite a while now.

As full disk encryption is a company requirement, what is the recommend way to apply Full Disk encryption on a new laptop? I will also have to instruct other colleagues to do the same, so I would be greatly helped if there is an official Dell instruction I can refer them to.