Try this

log out of QBO, clear the browser cache, close and reopen the browser, and log back in to see if it helped.

If you are using the app, try the browser instead

Resolution for 'browser instead issue: 'How can i Assign a Catagory to an Inventory Product' available: Yes.

The browser instead 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 instead issue yourself by looking for a resolution described in the article. If it is a complex browser instead issue or you are unable to solve the issue, you may contact us by clicking here or by using other browser instead support options.

For more information about resolving issues related to browser instead in Quickbooks/QBO or to get support for the issue 'How can i Assign a Catagory to an Inventory Product', click the link below: