The user interface changes in appearance depending on the mode you’re in. You can switch to a different mode using the buttons in the right panel or by going to Configuration - Mode - Simple/Advanced/Expert.
The reasoning behind the Simple mode is to lower the learning curve for beginners and declutter the user interface for casual users. Complex features like modifier meshes are hidden, and only a basic subset of parameters is shown to the user.
In the Advanced mode, more parameters are shown, and in the Expert mode, all the power features of PrusaSlicer are accessible. To make the learning of parameters easier, we color-coded them