remove_systems.md

---

title: Remove Systems from Schedules
authors: ["@hymm"]
pull_requests: [20298]

---

A long requested feature has come to Bevy! You can now remove systems from a schedule. The previous recommended way of preventing a scheduled system from running was to use RunCondition's. You will still use this for most situations as removing a system will cause the schedule to be rebuilt. This process can be slow since the schedule checking logic is complex. But in situations where this is not a problem, you can now call remove_systems_in_set. The advantage of this is that this will remove the cost of the run condition being checked.

app.add_systems((system_a, (system_b, system_c).in_set(MySet)));

// remove a system
schedule.remove_systems_in_set(my_system, ScheduleCleanupPolicy::RemoveSystemsOnly);

// remove systems in a set
app.remove_systems_in_set(MySet, ScheduleCleanupPolicy::RemoveSetAndSystems);