This type of customization is stored in permanent setting files: these settings are lost if you end your session.
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Select the Tools > Options command.
The Options dialog box opens. -
Select the Mechanical Design category in the left-hand box.
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Select the Assembly Design sub-category.
Four tabs let you set assembly and constraint settings to be used in an assembly document. 
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The General tab lets you set the general options.
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The Constraints tab lets you define the constraint options.
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The DMU Clash - Process tab lets you define the digital mock-up clash options.
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The DMU Sectioning tab lets you define the digital mock-up sectioning options.
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Select the General category in the left-hand box.
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Select the Parameters and Measure sub-category.
Various tabs are displayed, the Constraints and Dimensions tab lets you set constraint appearance settings to be used in an assembly document. 
- The Constraints and Dimensions tab lets you set the constraint ands dimensions appearance options.
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Select the Infrastructure category in the left-hand box.
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Select the 3D Annotations Infrastructure sub-category.
Various tabs are displayed and let you set annotation settings to be used in an assembly document. 
- The Tolerancing tab lets you set the tolerancing options.
- The Display tab lets you define the annotation display options.
- The Manipulators tab lets you set the manipulator options.
- The Annotation tab lets you the annotation display options.
- The View/Annotation Plane tab lets you define the view/annotation plane options.
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Select the Product Infrastructure sub-category.
Various tabs are displayed, the Cache Management and Cgr Management tabs also interfere with Assembly Design. 
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Select the General category in the left-hand box.
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Select the General sub-category.
The General tab lets you set whether the referenced documents in a CATProduct are loaded. 