The photo preview feature is enabled by default on your Windows 10 computer.
Thus you could preview pictures in a folder on Windows 10.
This is a convenient feature.

But you may disable it inadvertently.
Then you cant see the thumbnails of the pictures in a folder.
It is an easy job.

The following is a guide.
How do I Get Pictures to Show in a Folder?
How do I enable thumbnails in Windows 10 for pictures?
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it’s possible for you to run with this:
1.
- pull up the folder you want to preview the pictures in it.
ClickViewon the top menu and then go toOptions > Change folder and search options.

Switch to theViewsection and then uncheckAlways show icons, never thumbnailsunderFiles and Folders.
However, if that option has been already unchecked, the picture thumbnail may be corrupted.
ClickOKto save the change.

This can help you easily find the pictures you want to use.
How to Fix Corrupted Picture Thumbnails?
Windows 10 can keep the cache of the thumbnails of the files you open in File Explorer.

If you cant use the above method to enable picture thumbnails, your picture thumbnails cache is likely damaged.
you could use Disk Clean-Up to fix this issue.
Disk Cleanup is a useful tool to free up disk space.
But, do you know what is safe to delete in Disk Cleanup?
Now, it’s possible for you to read this article to get the answer.
Search fordisk clean-upusing Windows Search.
snag the first search result to open Disk Clean-up.
ensure the drive C is selected and then clickOK.
UnderFiles to delete, you oughta scroll down to find theThumbnailsNormally, it is selected by default.
If not, select it to continue.
ClickDelete Fileson the pop-up interface to start the deleting process.
When the deleting process ends, the window will automatically close.
It has a trial edition.
If yes, you might use a full edition of this software to recover them without limits.