Q&A: How to play Sims 3 regular if I already downloaded an expansion?

I downloaded the normal Sims 3, then i downloaded the Late Night expansion pack, I’m a little bored of LN, so I wanna play the Sims 3 routinely once more. So, every single time I press the Sims 3 (not LN) begin-up shortcut, it just goes to the Late Night. Is there any way I could just play sims three regular? (with no deleting something)