You can turn collisions back on and notice how they affect movement. In Roblox Studio, the collisions feature lets you control whether parts can move through each other. When collisions are on, you can’t move a part into any place where it overlaps another part.
To turn collisions back on, click the Collisions button in the Model tab. This toggles it on and highlights it gray (Figure 2.27).
FIGURE 2.27 Collisions on.
Now as you move parts, you may notice a white outline whenever a part touches another part. This indicates that a collision is happening. We’ll talk more about collisions in later hours.