The 'hamburger' in the top left, or rathet the translucent box it is in, is the exact size of chrome's address bar, so my brain filtered it out, since there was a clear division between it and the rest of the screen, and being a solid colour, on load.
Since the buttons for discord, etcetera, were on the first screen, I hadn't bothered to look for a menu button, as I interpeted the opening page itself as intended to be a menu.
My apologies.
On the topic of autosaves, many games I play tend to overwrite your most recently loaded\saved — and in many cases only — save file when autosaving, so I feel most comfortable if I turn it off. I appreciate that, from how you worded it, the game has a dedicated autosave slot. However, if it has multiple auto save slots, I'd still like to turn it off as I have limited storage space.
I do appreciate you getting back to me on this. If there's any information that can assist in tracking down the bug, let me know how to find it and I will attempt to get it.