You can use the screen number + F9 to go to the desired panel in ISPF.
For example, If you have opened say 5 panels and you are in 1st panel and you wanted to goto 4 screen, you can just type number 4 at the command line and press F9 to goto the 4th screen.
Type 'keys' on command line. you will end up with different function keys with their function select any function key which has not been assigned any function then type 'swap list' besides that function key then exit from that screen.
whenever you want to swap between the screens press that function key and u can see the list of screens where u can select your desired screen.