To add a window in Infurnia, follow these steps:
Go to the Floorplan view.
Click on the "Window" option, which is available on the Home ribbon or the Architecture Ribbon.
A default window will appear, and your cursor will turn into a window placement tool.
Move your mouse along the wall where you want to place the window.
Once you've reached the exact location where you want to place the window, click once to insert the window into the wall.
Select the window again to make any changes to the window to the window size, location or model.