DisplayFusion will manage your dual monitors. Either you have multiple monitors or projectors, this program enhance the management and productivity for multiple monitors.
Add separate taskbars on each monitor with all features like on main display (Start, auto hide, shortcuts etc.), manage different wallpapers and screensavers on those devices, create custom functions to personalize look and feel or functionality for each profile, configure characteristics for each monitor separately (resolution, refresh rate etc.).
With this tool you can change primary monitor, enable or disable monitors as you want.