I appreciate you reaching out, @Finance-Finance.
Please know that this new layout is the latest version of QuickBooks Online design, created to offer improved features and functionality for all users. All US-based QBO accounts have been permanently transitioned to this new layout, and switching back to the previous version is no longer an option.
We understand that adjusting to a new layout can take time. I encourage you to explore the new interface, as it offers advanced tools to improve your overall experience with QuickBooks.
Feel free to leave a message below if you need any additional assistance with the new interface.