The same tool that can be used to permanently activate a Windows install can be used to permanently activate an Office install as well; including 365.
Oh, and the tool to do so is open-source.
Or you could just dump Microsoft entirely (unless you need Excel in particular). Either way, it's free.
Yeah... despite the local Wal-Mart having quite the selection for the garage chemical enthusiast, I'd rather not publicly outline terrible ideas that could lead to others being severely hurt or killed.
Though I will throw out there that the access for the fire suppression/sprinkler system is usually fairly easy to access, and covers the entire store when it goes off, conveniently aerosolizing whatever liquids might be in the pipes...
I'm fairly confident it's Obsidian, and not sure if the theme's even been changed, as the default Obsidian in dark mode looks the same. Not sure if Logseq uses the same icons like on the left, but Obsidian does for sure.