Hello,
The quickest way to change this back would be to rebuild your preferences.
First close Pagemaker. Then:
On the PC find the RSRC folder inside of Pagemakers folder.
You will see a folder called usenglsh, open it. In side this folder you need to look for PM65.cnf (if you dont have your extentions showing this will not show up but you can right click on the PM65 and chose properties this will tell you if it is the pref icon) Delete the .cnf file and then close all the folders. Restart Pageamaker.
On the mac look for the preference folder inside the system folder. In there is a pagemaker 65 pref put it in the trash.
then close all the folders and restart pagemaker.
This will reset all your prefs back to orginal.
Good luck.