The sample size of the eyedropper an Adobe Camera Raw. Thanks a lot!

When using Photoshop tools, you can choose the color picker’s sample size – point sample, e.g 3x3 average or 5x5 average. I don’t know how to figure out what the sample size is in ACR. Can you show me where to check the sample sample size and change it, please! And how can I check or change the sample size of the eyedropper an Adobe Camera Raw. Thanks a lot!