Can't see the alpha/texture of sculpting brush when changing size Very new to blender, so I don't even know what the name is for what I'm describing, or how to find the name, will attach pictures.
Basically, have been watching some tutorials for sculpting in blender, and notice that when the tutor adjusts their brush size, they can see the alpha(?)/texture projected into in the viewport.
Like this

But when I load up a new sculpt, I can't see the texture, it just looks like this.

Might the tutors have just uploaded a different texture prior to the tutorial, or is there some setting that I haven't found to make your alpha/texture visible?
You need to enable the Falloff visibility in the Tool settings. You can access it in the header of the 3D view while sculpting or in the Tools properties in the properties editor.

Arguably the tooltip and the panel in which you access the overlay properties are misleading.
You can also change the opacity there. Enabling the Brush icon button will remove the overlay once you have clicked so it doesn't cover your mesh while sculpting.