Yes but you have to open additional browser windows.

Resolution for 'browser windows issue: 'can I have multiple windows open in QB 2017 online?' available: Yes.

The browser windows issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the browser windows issue yourself by looking for a resolution described in the article. If it is a complex browser windows issue or you are unable to solve the issue, you may contact us by clicking here or by using other browser windows support options.

For more information about resolving issues related to browser windows in Quickbooks/QBO or to get support for the issue 'can I have multiple windows open in QB 2017 online?', click the link below: