QB Issue Resolution:

You can access the whole list of keyboard shortcuts by pressing Ctrl+Alt+? on your keyboard. I have attached a screen shot of the list you’ll get.

Resolution for Issue 'When entering checks there’s a save and new KEY COMMAND' available: Yes (Solved).
Source: Intuit Community forum.

When entering checks there’s a save and new KEY COMMAND: 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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