This tab defines the area of the bed to be probed when using Mesh Compensation. In config.g this is expressed as M557 and defines the area of the bed to be probed when using G29.
Typically this is used with a Z Probe, but it can actually be done manually as well.
Even though the stock Ender 3 doesn't have a Z probe, we will define the probe area anyway just in case you add a probe in the future.
Set the area to be X min 20, X max 200, Y min 20, Y max 200, with a spacing of 20mm. This should be a safe starting point. The exact values will depend on your bed, the probe offset, and your XY travel limits.
See this guide for further information on using mesh bed compensation:
Mesh bed compensation
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