The 
Part Workbench and the 
PartDesign Workbench use the same preferences. They can be found in the 
Part/Part design section of the Preferences editor. This section will only be available if one of the workbenches has been loaded in the current FreeCAD session.
There are four tabs: General, Shape view, Shape appearance and Measure.
On the General tab you can specify the following:
+++ | Name | Description | +=========================================================================+=========================================================================================================================================================================================================================+ | | If checked, the Boundary representation (BRep) of the model is validated after boolean operations. | | Automatically check model after boolean operation | | | | | +++ | | If checked, the model is refined after boolean operations. | | Automatically refine model after boolean operation | | | | | +++ | | If checked, the model is refined after changes to source sketches of objects. | | Automatically refine model after sketch-based operation | | | | | +++
On the Shape view tab you can specify the following:
+++ | Name | Description | +=======================================================================+====================================================================================================================================================================================================================================+ | | Maximum linear deflection of the tessellated objects from their surface. | | Maximum deviation depending on the model bounding box | | | | | +++ | | Maximum angular deflection from one tessellated object section to the next section. | | Maximum angular deflection | | | | | +++
On the Shape appearance tab you can specify the following:
+++ | Name | Description | +====================================+===========================================================================================================================================================================================================================+ | | Color for new shapes. If the option Random is set, a random color is used instead. | | Shape color | | | | | +++ | | Transparency for new shapes (v0.21) . | | Shape transparency | | | | | +++ | | Line color for new shapes. | | Line color | | | | | +++ | | Line thickness for new shapes. | | Line width | | | | | +++ | | Color for new vertices. | | Vertex color | | | | | +++ | | Size for new vertices. | | Vertex size | | | | | +++ | | Color of bounding boxes in the 3D view. | | Bounding box color | | | | | +++ | | If checked, the color of the interior side of faces will be the same as the exterior side. If not checked either the backlight color, if enabled, or black will be used instead. | | Two-side rendering | | | | | +++ | | Text color for document annotations. There is currently no dialog to add annotations to documents. Annotations can only be added using the Python console with this command: | | Text color | | | | | | | | | This console is shown using the menu View → Panels → Python console. | +++
These preferences control the appearance of measurements created with the Measure tools available in the Part Workbench and PartDesign Workbench.
On the Measure tab ((v0.21) ) you can specify the following:
+++ | Name | Description | +==========================================+======================================================================+ | | Color for 3D linear dimensions. | | 3D color | | | | | +++ | | Color for delta dimensions (parallel to the global X, Y and Z axes). | | Delta color | | | | | +++ | | Color for angular dimensions. | | Angular color | | | | | +++ | | Font size in pixels. | | Font size | | | | | +++ | | If checked, font style bold is used. | | Bold | | | | | +++ | | If checked, font style italic is used. | | Italic | | | | | +++ | | The font to use. | | Font name | | | | | +++ | | Press this button to update existing measurements. | | Refresh existing measurements | | | | | +++
In order to display an object efficiently its surface is tessellated, i.e. it is displayed with some small deviations from it real surface. This applies not only to PartDesign models, but also to other objects in FreeCAD.
There is a lower limit for the tessellation of 0.01%. If you really want to spend the additional time you can reduce the lower limit even further by opening the menu Tools → Edit parameters... This opens the parameter editor where you navigate to BaseApp → Preferences → Mod → Part.
Right click on Mesh deviation choose in the context menu Change value. Set the value to the minimum tessellation of your choice. Please keep in mind that the value is in %, i.e. for a value of 0.005% you have to enter "0.00005". The smallest value possible is 1e-7. Note: In the preferences menu you will still see 0.01% even if you set a lower value.
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