Viewports behave like standard 2D objects, in terms of their stacking order and overlapping. You can adjust overlapping viewports using the Format menu (Bring to Front, Send to Back, etc.). See Stacking Objects.
You can find any tool by the Menu Structure HERE: https://turbocaddoc.atlassian.net/wiki/display/TC20UG/Menu+Structure
You can find the menu location of any tool by name HERE: https://turbocaddoc.atlassian.net/wiki/display/TC20UG/Tools+Mapped+to+Menus
Manage space
Manage content
Integrations