Thanks for getting back to us, @WiggaramaUK.

I appreciate your effort in following the steps provided by my colleagues. No worries, let's work together to have your toolbar work back to normal so you can get back to business seamlessly. 

Yes, we suggest logging in to your account through different browsers. It allows you to access QuickBooks Online (QBO) with a fresh start which prevents unexpected behaviors from QBO. 

Please refer to this article to find out what browser works best for you to have a better QBO experience: System requirements for QuickBooks Online and QuickBooks Online Accountant.

In addition, you may see this article to know what tasks you can perform in the navigation menu: Understand the navigation menu in QuickBooks Online.

Feel free to leave a reply if you have additional questions about navigating QBO. We're always here to back you up. Stay safe!