Enable preview without first selecting the file

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Is your feature request related to a problem? Please describe.
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To use the QuickLook preview, I have to first select the file in Explorer, and then press Spacebar. But me, like many, have enabled single-click to open files, not single-click to select and double-click to open. Selecting is done by hovering over the file, when a check-box appears and then click that to select. And only then I can press Spacebar to preview. However, it would be very helpful if when a folder is open, I can press Spacebar, and the first file is automatically previewed in QuickLook.

Describe the solution you'd like
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When a folder is opened in Explorer or Files, pressing Spacebar (or an alternative key combo like Ctrl+Spacebar) will preview the first file in that folder, without the need to select the file first. Other files can then be navigated to in the preview window as usual.

Describe alternatives you've considered
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Selecting the file first is the only other alternative but for people who have enabled 'single click to open file' this is a much more cumbersome process involving 2 or 3 clicks before the Quicklook preview feature can be used.

Additional context
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Start by locating the existing Spacebar path that opens QuickLook for a selected file, then inspect how the open Explorer folder and its first file could be identified. Done means pressing Spacebar in an open folder previews its first file without prior selection, while preserving normal navigation and existing behavior.