The thing I disliked the most about Windows 10 was disappearing scroll bars. I finally found the setting to turn them off, and have the scroll bars be "normal," in Ease of Access in Settings.
Update 1-20-2019: I don't dislike disappearing scroll bars anymore. I hate them because they keep coming back. Windows Updates keep turning this back on and I keep having to turn it back off. So now we have to comb settings (again! *sigh*) and check everything else because this one canary turned up dead.
First how to do it, then the story.
1) Open Settings.
2) From the Settings screen open Ease of Access.
3) From the Ease of Access screen select Display.
4) Scroll down to the section Simplify and personalize Windows. Then change Automatically hide scroll bars in Windows to off.
There, it's fixed. And so are they.
Story of how I found this.
The last Windows Ten update somehow turned on spell checking in Edge Browser, among tings. So, I went on a search to find out how to turn it off. Documentation on Microsoft refers to turning off the main spell checking in settings, when one searches terms Edge with spell check. Unfortunately, the main reason for this is the documentation contains an advertisement: "Get Edge Browser," or something like that. So that works as a search term, and the document may or may not be germane to Edge.
I came upon a few things where people asked for help on the help site, but all they got in reply was to turn off spell checking in main settings. Like me, this setting did not affect Edge browser's spell checking for those other people.
I tunnelled through Edge off- and on-line, Windows, and personal settings like a psychotic mole. So much stuff. Edge is Internet Explorer, but it also isn't, or something, so had to go there too. After a while scrolling through lists of this stuff gets old. It's dizzying, and also the futility is miserable. Nevertheless I bounced around for a while. Often I returned somewhere, to look again. It took a while to find out nothing and get nothing done.
Looking at settings, again, I thought sometimes they hide stuff as what is now termed Ease of Access. So I went there and found the scroll bar setting. I unselected, and the scroll bar appeared. I wondered about the times I looked for that setting. Is it new, or did I always miss it? That's moot now.
Later I asked Regina and Genevieve if they were interested in having fixed scroll bars. I was surprised that both of them hated the disappearing scroll bars. Both got real joy at the prospect of being out from under that.
Maybe others could benefit from this who also hate disappearing scroll bars: So I made a post.
That I found the setting with this update was serendipitous, because I had noticed the update made the hidden scroll bars even more difficult. I am someone who likes their controls to be fast and obvious, and has no use for over-use of cleverness. Even Microsoft docs say to be considerate in the way things are presented, so they aren't overly cryptic, by not doing things like hiding stuff.
Anyhow, that's it.