You can literally tell Notepad to shut it all down. All of it.
Figure it out. It's in settings. The settings keep changing, but you can dock it all down to no-AI, no tab memory, does "exactly what it used to, and no more."
And if that's not good enough for you, get Notepad++ already. It's a much better text editor and can do markup and automatic indentation of code with a closeable tree. Most of what I used Notepad for was editing .cfg, .ini files, and scripts, and I expect that's what many of us do here.
Only people who don't understand computers will need to swallow this. Nerds, if that's still Slashdot, don't have to. Be a nerd. Shut it down.