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To increase scheduled search capacity on a three-node search head cluster, adding another search head to the cluster is the most effective approach. This action distributes the workload across multiple search heads, allowing for more scheduled searches to run concurrently. Each search head can handle its own set of searches, thus improving the overall performance and capacity of the search head cluster, especially during peak usage times when many searches are scheduled.

Increasing the number of search heads enhances the cluster's ability to manage additional parallel searches and ensures that the system is more resilient to heavy search loads. This scaling approach is critical in large environments where data and search demands continuously grow. A search head cluster's architecture is designed to work more efficiently as more nodes are added, provided other configurations are optimized as well.

Other options, while they may have related implications or effects, do not fundamentally address the need for expanded capacity for scheduled searches in the same direct and effective manner as adding another search head.