Modify mask outside canvas edge

It’s been a while since setting up a new install of Photoshop and having trouble remembering how to change this, and hoping someone can point it out as searching isn’t coming up with anything. I want to allow editing of a mask off the canvas edge, such as using a brush or selection fill. For example this vector shape with a glow effect goes outside the canvas area, and I want to mask it using a selection. Currently the selection only affects inside the canvas area, allowing the bits of vector shape outside the canvas to still be there and produce a glow effect.