I'd appreciate it if you can get back to me with the results. Scroll down to the Get the QuickBooks Mac or Windows App section, then click the Free Download button. Lastly, if the above steps won't work, we'll have to uninstall and reinstall the QBO application. This step will help us clear out the stored files which impact and causes issues in the program. If the program still closes after opening another tab, clear the cache by going to File in the upper left corner, and then Clear Cache. These will help you fix some minor data issues in the program.
Since the application closes after opening another window, I'd recommend performing the following troubleshooting steps. This way, it would be easy for them to do multitasking while using the app. Windows App for QuickBooks Online (QBO) allows our users to open multiple tabs. That said, let me provide you another step on how to resolve this issue. Thanks for getting back to this thread and adding clarifications to your concern in QuickBooks, definitely understand how it can be frustrating to sign up for a service and have it not work the way you think it should be.