QB Issue Resolution:

this sets a key stroke to start the screen saver immediately, use it when you leave your desk

  1. Choose Apple menu > System Preferences, click Desktop & Screen Saver, then click Screen Saver.
  2. Click Hot Corners.
  3. Click the pop-up menu for the corner you want to use, choose Start Screen Saver, then click OK.

this sets a password for the screen saver, no one can get access until the screen saver password is entered

http://www.macforbeginners.com/osx-guide/screensaver-password-protection/

Resolution for Issue 'Is there a way I can password protect my QB OL so if not used for some time, a password is needed to gain access? Currently my staff could view if I am out of the office' available: Yes (Solved).
Source: Intuit Community forum.

Is there a way I can password protect my QB OL so if not used for some time, a password is needed to gain access? Currently my staff could view if I am out of the office: 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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