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Hover over Show, and then select Preview pane. Open Windows File Explorer, select the View menu in the File Explorer ribbon. Ensure that Show preview handlers in preview pane has a check next to it in order for the preview pane to display. Under the View tab, you will see a list of Advanced settings.
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Open the Options menu in Windows File Explorer and select the View tab. If the preview pane does not appear to work after setting the extension to On, there is an advanced setting in Windows that may be blocking the preview handler. To enable preview support, set the extension to On. In addition to those, PowerToys also adds support for source code files (for more than 150 file extensions). PowerToys adds multiple extensions: Markdown, SVG, PDF, and G-code. Preview Pane is an existing feature in the Windows File Explorer which allows you to see a preview of the file's contents in the view's reading pane.
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For thumbnail preview, PowerToys adds multiple extensions: SVG, PDF, G-code and STL. Showing thumbnails is a built-in Windows feature.
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