I can also choose to edit a copy of the original and that will cause the Lightroom adjustments to not be visible.
I may have applied some basic adjustments in Lightroom's develop module before I'm ready to work with the image in Silver Efex Pro and I certainly want those adjustments to be applied. When I choose that menu command I'll be asked if I want to edit a copy with my Lightroom adjustments intact? And that's the option I utilize. I'll select an image that I want to process with Silver Efex Pro and then from the photo menu, I'll choose edit in, followed by Silver Efex Pro 2. And here in Lightroom the process is very similar. If you're managing your images with Adobe Bridge, you can select an image, and then choose tools, Nic Collection, and Silver Efex Pro 2 from the menu. That will launch Silver Efex Pro with your image active. If you're using Photoshop as your host application, you can first open an image and then choose filter, Nik Collection, Silver Efex Pro 2 from the menu. You can also, though, utilize Photoshop or Adobe Bridge as your host application for Silver Efex Pro or the other applications in the Nik collection. I utilize Adobe Photoshop Lightroom to manage my images and so I use Lightroom as the host application for Silver Efex Pro. And because Silver Efex Pro is not a stand alone application that means you're going to involve another application, a host application where you'll select the image that you want to work with and send it to Silver Efex Pro. The first step to working with an image in Silver Efex Pro is, of course, to open that image in Silver Efex Pro.