How to deactivate previews in Konqueror?

[David]

I guess it is a silly question, but I do not find the option.

I am happy with previewing the images, but I'd like to deactivate the
preview for text files. It is pretty useless and I would like to visually
distinguish by the icons the tex, mathematica, etc, files.

Where is the option to do so?

Thank you.
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