In the planning tab, I am trying to update the budget to actual, but after input, it will not update

The moment you add, change or delete a register transaction, the budget is recalculated in the background.
When you open the Budgets view, no additional calculations are necessary.
When changing a monthly budgeted amount and saving it, all necessary rollup calculations are performed as the screen refreshes.

What makes you think there's a problem? Can you show us with a screen image snapshot and explain, please?