In the case of a function call by a jump to subroutine instruction, all the source lines/instructions in the function are treated as one step and the program will be executed until reaching the position to which it returns from the function (step execution will continue until the same nest is formed as when a jump to subroutine instruction has been executed).

Click the button on the debug toolbar to perform Step over execution.

In the case of other than a jump to subroutine instruction, operation is the same as when the button is clicked.