The preferences for the 
Assembly Workbench can be found in the Preferences Editor. In the menu select Edit → Preferences... and then Assembly. This group is only available if the Assembly Workbench has been loaded in the current FreeCAD session.
There is only one page: General.
On this page you can specify the following:
+++ | Name | Description | +======================================+============================================================================================================================================================================================================================================================================================================================+ | | If checked, pressing the Esc key leaves Assembly edit mode. | | Esc leaves edit mode | | | | | +++ | | If checked, the dragging steps of the solver are logged. Useful if you want to report a bug. The files are named runPreDrag.asmt and dragging.log and are located in the default directory of {{Incode|std::ofstream}} (on Windows it's the desktop). | | Log dragging steps | | | | | +++ | | When you insert the first part in the assembly, you can choose to ground the part automatically. The options are: | | Ground first part | | | | - Ask | | | - Always | | | - Never | +++
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