text too small

[Jim]

Good morning,

I've got a machine running Kubuntu 18.04 64 bit.  When I log out and log 
in or press ctrl alt backspace; beginning at the login screen the text 
is much smaller.  The first time this happened, I reset the text to make 
everything the size I wanted.  When I rebooted the machine, the text was 
too big, so I made it smaller. It wasn't doing this when I first 
installed the OS on this dinosaur.  Any idea what happened, or more 
importantly, how I fix it?

thanks