In the Rules and Actions view you can exclude any recently applied changes from the Rule Engine for today, since yesterday, or for the last 7, 14, 30, and 60 days. 

Note: This feature will exclude recent changes done for the same level in Rule Engine, across any strategy. For example, if you have two strategies (1 & 2) for device bid adjustments, and select "Exclude Recent Changes", then the device bid adjustments changed by strategy 2 will be excluded from strategy 1's results.

A common use case for this would be when you're running daily rules to change bids, as it would prevent bids from stacking up.