Innovations in user interface (“UI”) features of an electronic gaming device, and in features of backend processing to implement the UI features, are presented. For example, control logic selects symbols to be displayed for dynamic symbols for reel strips used in the electronic gaming device. The symbols selected to be displayed for dynamic symbols differ between game types. An electronic gaming machine can be associated with different gameplay divisions, such as different wager levels. Different gameplay divisions can be associated with different states, such as being in a base game mode or a special event mode, or having different numbers of spins remaining in a special event mode. A user can switch between gameplay divisions, where a state is resumed when a user switches to a different gameplay division.