I'm unable to encrypt an external hard drive because the encryption option seems to be missing. Various answers pointed to doing something with the 'Partition' button, but that button is greyed out. To solve the greyed-out issue, evidently, I first need to click on the 'view' button, but I have no view button! 

(Specifically, I don't see a view button on my screen and the partition tab is greyed out.)

[![enter image description here](https://i.stack.imgur.com/XLbRP.jpg)](https://i.stack.imgur.com/XLbRP.jpg)