Windows 10 Preview Pane Not Working (Grayed Out)

I ran into a problem in Microsoft Windows 10 where the “Preview pane” option was grayed out in the File Explorer. I could not preview images or documents on the right pane. The options to change icon sizes was also missing.

To fix this issue, try the following steps:

1. Download PreviewConfig.zip from WinHelpOnline.
2. Run the PreviewConfig.exe file.
3. Select the file type you are having problems with, select the “Preview type“, then select “Apply“.  I had problems with “.jpg” files. So I selected “.jpg“, then selected “Media file” > “Apply“. These steps actually fixed preview problems with all my files.