You can turn it off in the "add on management" section. I can't remember the add-on and module you need to disable, but it's there somewhere (check with your users too - when I did it, there was a lot of negative feedback and it was quickly re-enabled)
Just a warning - disabling the preview feature for attachments (as described here - https://community.atlassian.com/t5/Confluence-questions/Is-there-a-way-to-turn-off-the-quot-preview-quot-feature-and/qaq-p/201649) has pros and cons:
There's an open feature request in the Confluence backlog to allow disabling of file previews for specific file types - CONFSERVER-36899. It is still open as of today :-(
Hi my Community friends! For those who don't know me, I'm a product marketer on the Confluence Cloud team - nice to meet you! For those of you who do, you know that I've been all up in your Co...
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