Format has changed on my tablet and I can’t seem to maximise the screen for eg invoices are small and seem limited to a much smaller window

Hello, @info-evchargepoi. 

I can help you fix this odd behaviour of your invoicing screen. 

Are you using the QuickBooks Online (QBO) app or a browser in your tab when logging in to your account? That will surely help us provide an accurate solution to this concern.

You can try to clear the app cache or data storage if you're using a QBO app from your settings. Or refer to this article on how to delete browser cache and Intuit-specific cookies to quickly fix issues when using QuickBooks Online: Clear cache and cookies to fix issues when using QuickBooks Online. 

Check out this video tutorial on how to record an invoice and customer payment in the app: Receive an invoice payment using the QuickBooks Online mobile app.

I'm always here if you need more help with your invoices page. Let me know by leaving a reply below. Have a great rest of the day!