One feature in AD is bugging me for quite some time now. When I type the letters fi, they disappear. I already found out I can fix it by disabling Character > Typography > fi, but every time I open a new document it's enabled again. In my case, it's particularly annoying because my last name and my company name start with fi.
So how can I disable this permanently? I don't even know what it's for, so I am probably never going to use it anyway.