TR 3.7 trgtd.conf does not have a fontsize parameter. Found an old fontsize fix, saw where it was located in the .conf file, and copied it into my own .conf file. Then I changed the fontsize to help my aging eyes, one of which is blind. Here is my .conf file:
default_userdir="${HOME}/.thinkingrock/tr-3.7"
default_options="--locale en:UK --branding trgtd --fontsize 22 -J-client -J-Xss4m -J-Xms64m -J-Dsun.java2d.noddraw=true -J-Dsun.java2d.dpiaware=true -J-Dsun.zip.disableMemoryMapping=true"
#jdkhome="jre"
The fontsize parameter disappeared some time after my fix in V 3.4. You can just add it back.