Dear @Jodie Thoms,
Good day! Welcome to Microsoft Q&A forum!
Based on your description, I understand that after switching to the new Outlook, you’re experiencing issues with how email attachments are displayed. Specifically, the full attachment names are no longer visible, which makes it harder for your team to identify important details like schedules and order sheets. Additionally, only three attachments are shown by default, and with up to eight attachments in some emails, the small “more attachments” option can easily be overlooked. You’d like to know how to restore the previous view where all attachments and their full names were clearly displayed, as this change has caused workflow challenges in your department.
I sincerely apologize for the inconvenience caused by this issue.
Regarding this matter, I have tested on my environment and also my colleagues' and we encountered the same option 'Show all X attachments' when sending many attachments in one email:

Even when I opened the email in a new window:

This appears to be part of the new Outlook design update, which aims to provide a cleaner interface and reduce clutter in the message pane. At this time, there isn’t a setting to revert to the classic view where all attachments and full names are displayed inline.
If this design is creating challenges for your workflow, I encourage you to share your feedback directly with Microsoft through Help > Feedback in Outlook. Your input will go straight to the product team and plays a valuable role in shaping future improvements.

Additionally, you can use this link https://feedbackportal.microsoft.com/feedback/idea/72f0a6bc-5b99-f011-aa44-6045bd7f402a to vote for an existing suggestion about this exact issue or submit a new idea via Feedback Portal if you’d like to provide more details. This helps the product team prioritize changes that matter most to you.

Note: As Microsoft Community moderators, please note that we are not involved in product design decisions and do not have direct access to the development roadmap, we want to assure you that your feedback has been acknowledged and is valued.
If you decide to send new feedback of your own, kindly send the link here so I and other users with the same query could help add a vote to your feedback.
Thank you for your kindness and understanding!
If my answer somehow provided you with useful information, please consider clicking 'Accept Answer'. This helps highlight the solution for others who might have the same question from your experience.
Thank you for helping the community!
If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.