How to change primary workrelationship date

Summary:

WR1: Start date 2024/04/15 > this is supposed to be terminated on 2025/05/14

WR2: Start date 2025/03/17

 We set WR2 as primary (by mistake) from the 2025/06/10,and now it's not possible to terminate WR1 from 2025/05/14 since it's still primary at that date.

How change the work relationship(WR2) as primary in which date is best for terminate the WR1 on 2025/05/14.

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