If you want to change the abap editor setting you need to go to abap work bench.
Use any of the following transaction and go in to the abap work bench.
SE38 –> Report
SE37 –> Function Builder
SE24 –> Class Builder
SE80 –> you can edit all programs from report to class module.
First on in to any one of the above transaction and click on the utilities–>Settings. See the following screen shot for old and new version.


The old abap editor config has only two editor styles but with the new one net weaver we have a new editor which is pretty good. See the difference in the following screen shot.
Old Version and the new version


the new version on sap has a new front end editor which has source code reference and key word highlight and all other futures. I really like this editor. I just want you know this is very good option and you can collapse the code between block of statement. you should try this out.
Debug Mode: See the following screen shot which is very useful and new in this editor if there is a running program and you want to stop the code in between you can do that by activation the flag. This will sync immediately as soon as you put a break point and if there is a running program that will stop for this break point. I think this is very useful if there is a big job that you started and want to see where the program is and how many records are processed.
Click on the following link and see if all the available options on the abap editor and on the ABAP work bench.
http://help.sap.com/saphelp_crm50/helpdata/EN/ca/c035baa6c611d1b4790000e8a52bed/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/EN/ef/d94b78ebf811d295b100a0c94260a5/frameset.htm
There are lot of new options that is pretty straight forward and pretty cool and useful. Please try it out.
Let me know if you have any questions.
