Can I use the knockouts right next to my ground bar, or does it permanently block them? I'm wondering if I am allowed to run conductors across/over the ground bar and if I can put EMT connectors in these knockout holes.
I have used many panels just like this I usually don’t move the buss but it is easy to do the 2 screws are usually 10-32 self forming screws that hold the buss in place move it if you would like, code has no requirement on the position.
If you can’t or don’t feel comfortable with that location move the buss. I always have a set of drill/taps for box modifications they drill and tap in one quick operation if using a tapped hole it’s a lot easier to put the screws in and code legal with a 32 pitch screw.
Never use self tappers inspectors look for those and will red tag a job if they see one. Self forming machine screws are different and have the 32 pitch most commonly 10-32 but I have found some 8-32’s used by different mfg’s.