QB Issue Resolution:

It could be the Hamburger (three parallel lines) icon is clicked, which is why the left sidebar disappeared.

To help fix this, let’s click the Hamburger icon again to show the menu. Please see the screenshot below for your reference.

However, if it isn’t still showing, let’s perform some browser steps to help isolate the issue. You’ll first have to access your QBO account through a private browser since it doesn’t store data in the cache. If you’re using Safari, press Command + Shift + N on your keyboard. For Mozilla Firefox and Internet Explorer, you can hit CTRL + Shift + P. Press CTRL + Shift + N for Google Chrome.

If private browsing works, let’s clear the cache of your regular browser. This helps the browser to function efficiently. Then, you’ll now see the left sidebar. If not, I’d suggest using other compatible browsers.

I’m adding this resource hub to learn more about recording your info, managing money in and money out transactions, and the basics of QuickBooks: https://quickbooks.intuit.com/tutorials/all-quickbooks-tutorials/.

Resolution for Issue 'How do I show the left sidebar? I has disappeared.' available: Yes (Solved).
Source: Intuit Community forum.

How do I show the left sidebar? I has disappeared.: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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