Mistakenly deleted Debug settings in 'Build Settings' while checking for NSLog outputs in debugger

I was trying to toggle Debug settings in Build Settings to check if NSLog statements between #ifdebug and #endif stop printing in the debugger.I ended up deleting the settings thinking cmd+z will undo it. Can you help me get them back?

I'm asking about the one that says DEBUG=0 or DEBUG=1

Also, If I can know how to toggle them?

Thank you.