Only getting sound through headphones

Hi all

I’m using a Midas 32 mixer to have a couple headset mics sent to for a conference. When running a sound test using a shire sm58 mic I had sound coming through the desk but then I pressed “pre fade insert” and now I’m only getting sound through a pair of headphones plugged into my mixer.

Help me figure how to get sound back to monitors.

I reset the mixer and turned it on and off and seem to only have sound through headphones when sliding the faders on channel 8 or the master