Are you talking about looking at a project that you have modified in the past and comparing it with a previous version of the project? There is no inbuilt archival feature for old versions of projects you were working on. Generally we recommend creating several backups of projects as you work and develop them. If you have backups of your projects as you work and develop them it is easy to compare the automation logic by starting up two Robotic Studios and comparing the two.
I get that, but I am actually talking about something like version control. If I can see the code different of os file visually (not position of components in codes, the actual shape of components), that will be greatly helpful.