Moving the mouse up will lift the Sims 4 boobs, and sliding the mouse down decreases the level. Moving your mouse up or down will help you with this. It is also possible to adjust the height of the breasts. Both ways, the Sims 4 breast slider works perfectly. You can use the slider while creating a Sim or use it after you have already created a Sim. This breast slider helps in breast augmentation as well as breast reduction. Moving the mouse left and right changes the volume of the breasts. The game will enable the slider after clicking. Now, go to the CAS in Sims 4 and click on your Sim’s breast. One, an idea of the way you wish your Sims breasts look.