If you wish to lower your annual discretionary spending (in effect save more), you can create a bequest (Settings & Assumptions / Estate) and this will lower your annual discretionary spending.

A bequest ensures that the amount you indicate is available each year should you die in any given year. By default, term insurance is calculated, and entering a bequest may create a need for more term insurance to fund the bequest, especially in early years. If you set the program to not calculate insurance (Settings / Misc), the bequest will be funded by having you save more in regular assets and thus lower your discretionary spending as the program anticipates that end-of-life expense for the estate.