If the best result counts toward the combined-event standings then you cannot change heats for the 2nd time sprint.
However, it is possible to do a sprint number 2 times and only have the best performance count for the combined-events, only the heats are the same for the 2nd time.
You set this up by specifying 2 attempts for the 30 meter sprint when setting up the events. There will then be 1 judging form from Athletics.app, where there is room for 2 performances per athlete.
If this is a single event, please also read this answer:
https://www.athletics.app/faq/?qa=75/hoe-verwerk-je-2-starts-op-1-onderdeel
This has been automatically translated into English