Ensuring your 4-Layer PCB Stackup is working as intended is one of many responsibilities that Altium Designer’s layer stack manager is capable of.
In your career as a designer you will design many oddly sized and shaped boards including circular PCBs. You need the power of Altium Designer for these jobs.
Copper shorts can be identified with testing. Make sure you define test requirements in your PCB design software.
FR4 is by far the most popular set of PCB substrate materials. Here is how FR4 dielectric constant and your material properties will affect your next PCB.
Make sure your high voltage PCB design is safe and manufacturable with the complete set of design tools in Altium Designer.