Ever since I upgraded to CCleaner professional, my quick settings have disappeared. I have tried all sorts of solutions, but nothing has worked. This issue seems to correspond to when I allowed CCleaner to manage driver updates and other sorts of housekeeping. If anyone has any idea of how to fix this problem, please let me know. Thank you!
Quick Settings sometimes stops functioning or goes missing; it happens even to those who don’t use CCleaner.
Usually an ‘End Task’ and restart of File Explorer will fix it.
Or just ‘Restart’ (not shutdown) the computer.
If that doesn’t work then you should try using DISM and SFC to repair the system files.
If those still haven’t fixed it then you may have a corrupted User Profile, so may need to make a new User and copy things across from the broken one.
For instructions on how to do each those, have a look at this:
Thank you for the video. I tried everything up to the point of making a new profile or resetting Windows. Quick settings still do not work. 
I am unsure if I want to go through the hassle of creating another profile or resetting Windows.