Select Budget Method window appears just one time only

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Hello experts,

before distributing budgets to line managers and after clicking on budget pool name link, the attached window appears.

However, this window is available one time only. If I need to change options how can I do it, as it is available just the first time you click on the budget pool name? Is there a way to change options overtime?

Thanks in advance for your time!

Kind Regards,

Valerio