Is it possible to display critical path?

Yes, it is possible.

By setting conditions in ACTY'S, Critical Path is automatically detected and highlighted, which is useful for intensive management.

It is displayed as red bars by default, but you can specify the color and symbol like any other bar.

[Example of Critical Path display]

What is Critical Path? 
It refers to the longest path of tasks in a project, where there is no spare time. 
Delays in the tasks on the Critical Path should be the important management target, because that directly lead to delays in the entire project.

C_KTZ_PMG_4_2205_00049_00