Please give an example of what input area you want to change.  I do not think you have an ability to change any calculated value decimal point. 

The only field that allows for rounding adjustments is the Estimated Taxes screen.  Payments, penalties & Extensions --> 2025 Estimated Tax --> 2025 Estimated Tax (1040-ES) the field is called "Rounding" enter the number that corresponds to how you want to adjust how the system rounds for estimated taxes.  All other decimal points are locked.