first of open an image folder then you will not able to see image preview that is the problem now you to do only few steps
Step 1 open a folder then in the header section click on the view button
Step 2 Go to the extreme right side and click on the option button
Step 3 you have 3 option general view search
step 4 click on view button
step 4 uncheck first option
step 5 apply
step 6 now you can see the image preview
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