Show Check Memo Field

I hope I understand your question....

While looking at the check register, under "VIEW" (pull-down option on the upper right of the display, do you have the SHOW ONE LINE display option checked?

(PS: While in a two line display, under EDIT (left hand side of the top action bar) under one of the preferences, you can toggle the order of the category and memo fields on that second line.)

I should have mentioned, of course, that if you DO have the one line display checked, then UNCHECK it and see if this does what you are looking for to the register.