Press Alt + Tab to switch away from the fullscreen window
Press Win + Shift + Left Arrow or Win + Shift + Right Arrow
Use the monitor-specific fullscreen toggle if the app supports it
Change the display settings to make the target monitor the primary display
Drag the windowed app to the other monitor, then return to fullscreen
Use the app’s settings to select the desired monitor
Press F11 to exit fullscreen, move the window, then press F11 again
Use Alt + Enter in apps that support toggling fullscreen mode