Safari windows won't default to fill the whole screen
Hi everyone, whenever I open a safari window (or other similar windows I want to be "full screen" but not in the full screen mode, it opens it up nearly fully with just a small portion not filled on the left. This is very annoying, and I can't figure out how to get it to stay in a truly full screen state. I quit safari after putting it how I want it, but it always reverts to this.
MacBook Pro TouchBar and Touch ID, macOS Sierra (10.12.6)