Hello Victoria Hayne,
It is important to note that the standard shortcut for this in both Windows 10 and Windows 11 is Windows Key + Plus (+). The shortcut you mentioned, Ctrl + Plus (+), is technically restricted to zooming content inside specific applications (like web browsers or Word documents) and does not scale the entire operating system. It is likely you were using the Windows key combination previously, as that is the native hotkey for system-wide zooming.
To replicate this in Windows 11, press the Windows Key + Plus (+). This will instantly launch the Magnifier and zoom in on your screen. You can subsequently use Windows Key + Minus (-) to reduce the zoom level or Windows Key + Esc to close the tool entirely. If you simply want to resize desktop icons or content within a window, holding Ctrl and scrolling your mouse wheel up or down will still function as it did in previous versions, but for the full screen zoom you are looking for, the Windows key is required.
I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!
VP