Altium: how to display all DRC errors?
If you have your rules set up properly, all you have to do is go to Tools --> Design Rule Check and click "Run Design Rule Check" at the bottom left of the pane. I tend to use the shortcut T-D-Enter and it does all of the above in just three keystrokes. This will list all of the design errors, provided you told the DRC to check them in the batch check. If you want to change what rules it looks for, go to Tools --> Design Rule Check (or shortcut T-D) and in the left-pane, under "Rules To Check", you can select your category and which rules you want the DRC to check.