QB Issue Resolution:

Command-W (hold the command key down and press W) will close the window. If you have edit it you’ll be presented with a warning sheet. Hit return to select the default option, which is Save.

I know, still two “actions”, but in practice cmd-W and then return is fast.

Resolution for Issue 'I just upgraded from QB 2011 to QB 2014 (for Mac). I don’t like it that I can’t save and close and invoice with one click. Can I change that.' available: Yes (Solved).
Source: Intuit Community forum.

I just upgraded from QB 2011 to QB 2014 (for Mac). I don’t like it that I can’t save and close and invoice with one click. Can I change that.: 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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