The runtime configuration object enables you to modify a limited set of configuration options at runtime.
The configuration options above are evaluated during the SAPUI5 runtime boots. After that, all changes to these parameters are ignored. To read the final configuration result, you can use the sap.ui.getCore().getConfiguration() method.
The same object also provides set methods for a very limited set of configuration options that can be modified at runtime. The runtime and/or the controls can react on these configuration changes. The most prominent (and so far only) example for such a configuration option is the theme.