Let's isolate what causes the issue, amalembainyanje.

There are times that an issue like this occurs when the system encounters browser-related concerns.

To start with, let's open QuickBooks in a private window. It is the best place to identify any browser-related issues. You may use these keyboard shortcuts to open one:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + P
• Safari: Command + Shift + N

If it works, you can go back to a regular browser and clear its cache. A piled cache can also be the reason for some unexpected behavior on the opened pages.

You can also switch to a different supported browser like Google Chrome, Mozilla Firefox, Safari, or Microsoft Edge.

I've also added this reference that has detailed information in categorizing transactions: Assign, categorise, edit, and add your downloaded banking transactions.

Let me know how these steps work on your end. Take care!