Good morning, @BrielleMarquez ...
If you are an instructor, this Guide shows you how you can do this: How do I embed documents from Canvas in the Rich C... - Instructure Community (canvaslms.com). In particular, look at the "View Link Options" section of the Guide.
If you are a student, a similar Guide exists for you, too: How do I embed a document from Canvas into the Ric... - Instructure Community (canvaslms.com). Again, you'd want to look at the area to "View Link Options".
In both instances, there is a check-box option to "Expand preview by Default" that you'd want to select.
Hope this helps! Sing out if you have any questions...thanks!
