wait for the logging rewrite to go through which would log to disk as well (so you don’t have to do anything)
right click the app and open the app as a folder. go deeper into the folder until you find the citra-qt file next to the citra-qt-bin file. you can edit the citra-qt file with a text editor and in there you should see
#!/usr/bin/env bash
cd "\`dirname "\$0"\`"
chmod +x citra-qt-bin
open citra-qt-bin --args "\[email protected]"
then when you launch the citra app it should write to citra-log.txt instead inside your homefolder. (note i don’t have access to a mac any more so i can’t test it)