I have lost the ability to scroll using my mouse

Hello there, @Andy11.

The scroll functionality in QuickBooks Online (QBO) software can be affected by the computer's display and browser zoom settings. Let me walk you through the process.

First, I suggest ensuring your browser zoom settings are configured correctly. For Mozilla Firefox users, you can increase the size of web pages. For Google Chrome users, you can change text, image & video sizes (zoom).

Next, please ensure your computer's screen resolution is set to 1024x768 or higher and the DPI is set to Normal or 100%. If you are working in QBO with a resolution of 1024x768 or lower, I recommend maximizing your browser window. 

Here's how to check:

• For Windows PC:  change your screen resolution in Windows.
• For Macs:  change your Mac display’s resolution.

Moreover, I'm adding this helpful article as you reference about the QBO system requirements: System requirements for QuickBooks Online products.

Come back to this post if you have further concerns and follow-up questions about scrolling through QBO. I'll be here to lend a helping hand.