No corner vertices bubbles on boxes

I use to be able to grab the corners of the box meshes and move them all around in order to better form my rooms, but for some reason they are gone and I can’t for the life of me find a way to turn them back on. I’ve been all over the internet and I greatly appreciate any and all help! ~Thanks, Alex

I figured out what was wrong, I wasn’t creating the primitives within the geometry tab, once I did so in the geometry mode I was able to see the vertices and move them around. They seem stiffer than I remember however.