Catch Flames Pro

Hi, I have installed your Catch Flames Pro theme and I'm having an issue with the archives page showing the full post no matter what setting I choose. I have tried various lengths on the excerpts ie 1 word - 30 words - 55 words. I have gone into the customiser > theme options > layout options > archive content layout and tried every selection. All display as a full post unless I go into each individual post and put in a 'read more' break. I have read your instructions for the theme and viewed your demos but I can't work out what I'm doing wrong. Thanks for your time. Lorraine