Updated color scheme options
In the initial version of Windows 10, most windows feature an ugly white title bar, which I feel detracts from the overall look and feel of the system. With the Fall Update, you can enable an option in Settings that applies the accent color to the title bar of most windows (as well as to Start, the taskbar, and Action Center), providing a nice bit of contrast.
More consistent context menus
Critics had a field day with the numerous different styles of menus that appear when you right-click (or tap and hold) on items in the Windows 10 UI. So Microsoft has made these menus more consistent with the Fall Update.
In the initial version of Windows 10, you were limited to 3 columns of medium tiles per group in Start. But now, you can optionally have a fourth column. To do so, navigate to Settings, Personalization, Start and enable the new option “Show more tiles.”
You can also display more items in Start: Where you were previously limited to 512 tiles and other items, you can now have up to 2048.
Finally, the context menu that appears when you right-click items in Start has been updated to display new icons next to relevant items like tile sizing.
New Control Panel icons
I’m not sure why they’re bothering with this, but Control Panel picks up some new icons.