Disable or Enable Automatically Hide Scroll Bars in Windows 10 Apps contains the registry files to enable or disable the old-style scroll bar in your UWP or Windows Store apps and Start Menu.
Download Disable or Enable Automatically Hide Scroll Bars in Windows 10 Apps, and extract the two files:
Disable Automatically Hide Scroll Bars in Windows 10 Apps.reg Default - Enable Automatically Hide Scroll Bars in Windows 10 Apps.reg
Double-click Disable Automatically Hide Scroll Bars in Windows 10 Apps.reg to restore the wide scroll bar.
Click Yes when prompted by User Account Control. Click Yes when prompted by Registry Editor.