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I'd suggest you start with a clean fresh configuration:

1. Quit qtractor if it's running;
2. locate the user's configuration file: should be found under home directory, in ~/.config/rncbc.org/Qtractor.conf ;
3. remove, or better yet, rename it to something else eg. from the command line:
   mv -vf ~/.config/rncbc.org/Qtractor.conf ~/.config/rncbc.org/Qtractor.conf.BACKUP ;
4. launch qtractor again and check in your preferences again, on the View > Options... dialog.

You should know by now that the OK button gets lit and enabled if aand only if you change a setting, any setting, and only if the change(s) are valid to proceed; the scratch configuration above is kind of a radical move, only about to dismiss on any old setting still lurking there from ancient versions of the program.

hth.
cheers