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Embird Manager / Options / Display Calibration.

You need to physically measure the screen with a ruler, and enter the value in millimeters. If you don't measure accurately, your on-screen display sizes will not be accurate. Circles may display as ovals, etc.

The Calibration Square must be measured with a ruler.  Most "software rulers" fail to accurately determine the size of the calibration square.

The Calibration Square must be measured with a ruler. Most "software rulers" fail to accurately determine the size of the calibration square.

No cheating, just grab a ruler, if you care about on-screen display accuracy.