If you have had it open before, try File > Open Previous Company. If not, try File > Close Company/Log Off. That will bring up the No Company Open window and you should see all files there.
Resolution for 'Company Open window issue: 'How to log into a 2nd account?' available: Yes.
The Company Open window 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 Company Open window issue yourself by looking for a resolution described in the article. If it is a complex Company Open window issue or you are unable to solve the issue, you may contact us by clicking here or by using other Company Open window support options.
For more information about resolving issues related to Company Open window in Quickbooks/QBO or to get support for the issue 'How to log into a 2nd account?', click the link below: