You can pause the simulation, change your code, and resume without leaving the environment.

Proteus Professional 8.9 SP0 (Build 27865) is a version of the electronic design automation (EDA) suite used by engineers for schematic capture, PCB design, and circuit simulation . Released around late 2019, this version introduced several significant updates, most notably a that makes files saved in 8.9 incompatible with older versions. Key Features of Proteus 8.9