Hello George,
Thank you for reaching out with your question about the preview pane in File Explorer I understand how frustrating it can be when the preview pane takes up too much space and affects your workflow.
Many users prefer a cleaner interface so wanting to remove or hide that pane completely makes perfect sense. The preview pane is a built-in feature of File Explorer and while it cannot be permanently removed you can hide it to free up space.
To do this open File Explorer go to the View menu on the ribbon and select Preview pane to toggle it off. This will effectively remove the pane from view, if you want to ensure it stays hidden check your folder view settings or group policy if applicable as certain policies can enforce its visibility.
Could you confirm if you are using Windows 10 or Windows 11?
I hope this answer is helpful if you have further questions feel free to reply back
Regards,
Marcelo