GD&T Feature Checks, unlike relationships, are not fully dynamic. The results are computed only on request and then remain static until an additional request is make. The reason for this is that GD&T evaluations include both a datum alignment step and an evaluation for each individual check which requires too much computation to be performed real in near real time.
Feature Checks are organized and evaluated in separate collections. The Evaluate All icon provides a convenient way evaluate all the checks in the Active collection. This same option is available in the right-click menu for the Feature Check category in the SATree.
Evaluation of individual features is tied directly to the Report Bar. When the report bar is open and a feature check is selected, this will automatically trigger a re-computation of the check to ensure that the current results are always displayed.