As issues arise in your PCB123 PCB Design Software you will see warnings popup on your screen. You can mouse over these objects to see a summary of the issues. If you would like to scroll through the reported issues you can press the "n" key on your keyboard and PCB123 will move to each DRC warning. You may want to zoom in on the reported area then press the n key.
At anytime you can run the DRC to look for issues. You can do this by selecting Design > Run DRC or by selecting the or depending on the PCB123 appearance option you have selected. After running the DRC you are presented with a DRC summary.
Uncheck the boxes for the drc warnings that you do not want to review and select the OK button. You can now zoom in on an area and use the n key to cycle through the reported warnings.
Another way to cycle through the drc warnings is to use the Edit Panel. At any time you can go to the bottom of the edit panel and select the DRC/ERC tab.
On the DRC/ERC tab you will see the following.
The Goto first and Goto next items perform the same function as pressing the n key on your keyboard. You can expand the Errors by category and Errors by Layer folders by clicking in the box located to the left of the folder label. You can the select specific DRC violations and PCB123 will zoom in the the specific location.