Both Windows and macOS include native support for multiple desktops, so you don’t have to keep all your windows crammed into one space. It’s like having several different monitors set up on your desk, without the expense of any extra hardware.
In macOS, these virtual desktops are called Spaces: You can find them by launching Mission Control from the dock or the Launchpad, or by using the Command+Up arrow keyboard shortcut. Move the cursor to the top of the screen then click the Plus icon to create a new Space.
Over on Windows, you need to click the Task View button, which is just to the right of the search box on the taskbar. This brings up all your open windows, and you’ll see the option to create a New desktop to give yourself more space.