Changing Solitaire Card Size

[S]

Hi
When playing solitaire recently, I pressed something that made the cards
large. I like the smaller cards. Does anyone have any suggestions on how to
change it back?

 

[Grasshopper]

If you are refering to the actual size of the cards, it changes automatically
with the size of the game's window. Just drag the border to adjust to the
size you want.
There is also something called "Large Print Deck", which can be changed by
clicking "Game", then "Change Appearance". From there you can select a card
deck and click "OK"