List views within interfaces, and List page layouts do not support/show the sum of values of a given field (e.g. number, currency, etc). However, this is actually supported for grid views. -see comparison in image below. Even if something similar can be achieved using different workarounds as mentioned by @ScottWorld and @ATSolutionist in this other post submitted by @Scott_Brasted, a native out of the box solution seems completely needed. Mike, Consultant @ Automatic Nation
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