When set to true, physically simulated objects will stop being simulated if they have little to no motion for a set period of time.

When set to true, parts that are BasePart/Anchored will show a gray surface outline on the surface of the part’s bounding box that is currently facing the ground.

When set to true, each physics assembly is assigned a unique color and the Part associated with the assembly are outlined with the color. Parts that are attached together by JointInstance will share the same color.

When set to true, parts that are actively being physically simulated will have a red outline.

When set to true, Part will be outlined with a specific color, depending on the state of its root simulation body.

When set to true, each contact island will render SelectionBox adorns on the parts in contact islands, where each contact island is assigned a random color.

When set to true, sphere adorns will be drawn at the contact points of each part where physics interactions are occurring.

When set to true, XYZ axes are rendered at the BasePart/CFrame of every part.

When set to true, every individual mechanism of parts is given a unique color.

An ancient property that hasn’t work correctly since late 2007.
It’s supposed to render an XYZ axis on the root part of a Model, but the axis rendering component doesn’t work correctly.

When set to true, each Player's character is outlined with a unique color, and each part that the player has network ownership over is outlined with the same color.

An ancient property that hasn’t worked correctly since late 2007.
It’s supposed to render a large XYZ axis in the center of each BasePart, but the axis rendering component doesn’t work correctly.

When set to true, a cylinder is drawn around each Player's character, representing their Player/SimulationRadius.

When set to true, parts that aren’t aligned on the 1x1x1 grid will be outlined yellow.

An ancient property that hasn’t worked correctly since late 2007.
It’s supposed to render a large XYZ axis in the center of the world, but the axis rendering component doesn’t work correctly.

When set to true, Roblox will fall back to using its legacy CSG solver when performing solid model operations.

This property is supposed to show the BasePart/ReceiveAge of a part, but it does not work correctly.

When set to true, the joint connections of each part, and the states of their underlying primitive components are visualized as a spanning tree.

Controls the throttle rate of Roblox’s physics engine.

When set to true, the underlying collision geometry for PartOperation and MeshPart is rendered.

If the PhysicsSettings/PhysicsEnvironmentalThrottle is set to DefaultAuto, this specifies the maximum time that the physics environmental throttle has to wait before it is allowed to automatically change.

If set to true, version 2 of Roblox’s CSG solver will be used instead of version 1.