If an Assembly-Table-Project is loaded, the docking windows Configurator and Assembly are not visible (Part view).

Assembly-Table-Project in the Part selection

However, when clicking on the command Show configurations and tables or on the respective button (only possible in Dev mode) in Configurator menu, the docking windows Configurator and Assembly become visible.

Command: Show configurations and tables

Docking windows "Configurator" and "Assembly" visible

Should the tabs not be visible or cut off, at the desired docking window, open the list field and select the item Configurator or Assembly.