When you set a printer as the default, all print jobs automatically route to that printer. You can change the default at any time. You can also select a different printer for any individual print job.
Set a printer as the default
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Confirm that your printer is connected and turned on.
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On the Apple menu, select System Preferences.
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Select Printers & Scanners or Print & Scan, depending on which version of macOS® is installed.

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Select the printer to be used as default from the Default Printer drop-down.

If duplicate copies of the printer exist in the printers list, you can delete them. To delete the previous copies, select the printer from the list and press the [-] minus button below the list.