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If no display on second screen (i.e. the customer-facing screen)
Arrange the two monitors upside-down like below. The primary screen as the main screen in the display setting.
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If you would like to run POS on In the browser, enable "pop-ups and redirects". The pop-up window will appear on the customer-facing screen.

(Edge)

Guide for enable pop-ups for Google Chrome:

• Block or allow pop-ups in Chrome https://support.google.com/chrome/answer/95472?hl=en&co=GENIE.Platform%3DDesktop#zippy=%2Callow-pop-ups-and-redirects-from-a-site