Individual inflation rates can also be specified for other expenses/incomes/social security/etc. By clicking on the specified section, you are able to hit edit to change the inflation rate.
Client Data -> Cash Flow / Goals –> (other expenses/other incomes/Optimize for Social Security)
The overall assumed inflation rate for the client can be set at the client Data -> General Information tab under a client scenario for an estimation for averaged future inflation. This is the default value by which expenses and incomes will grow in the future unless otherwise specified.
You can set default Inflation rates for all new scenarios by going to Account Settings > Preferences > Program Preferences