Windows are sub-areas within the EdgeCAM window dedicated to a particular area of functionality.
Examples are:
The Features window which you use to work with found features.
The Sequences window, in which you work with your machining instructions.
You can:
Auto-hide windows (this means the window collapses to a small marker at its docking point when you move the cursor out of the window; you expand the window back to full size by moving the cursor over the marker).
Move, dock and undock windows. Multiple windows can be docked to the same edge of the Graphics window. In this case:
The edge can be divided up into an area for each window.
Alternatively multiple windows can grouped into the same area, with tabs for switching between them.
You choose between these alternatives by how you dock the window. If tabbed windows are auto-hidden, there is a small marker for each of the tabs.
Change the font. This is a Windows setting; refer to your Windows documentation for details.