Press S to set Snap to ON. When you do that, that circle/sphere will be displayed in the centre (before that it would have looked like a square/box). Press S again to set Snap to OFF (so, pressing S will *toggle* the Snapping facility).
When Snap is on, you can Snap Objects to specifics parts of another Object, ie. from/to the object's Vertices, Edge, Face, Midpoint, Pivot Point or to the Grid.
So, it's very useful when moving objects around.
Try it with a few Primitives to learn more 🙂
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3d rendering services-------------------------------------------------
Asus X299-SAGE, 7980xe @ 4000mhz, Corsair Hydro H150i Pro,
1Tb Samsung M.2, 128Gb Corsair LPX DDR4,
2 x Nvidia RTX 3090 FE,
3DS Max 2023.1 (3DS Max 2022.3, 3DS Max 2021.3 as backup)
Windows 10 Pro.
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