Windowed mode in Windows?

How do I get Algoriddim into windowed mode?

I want to have it open on my second monitor and leave my main monitor available for other tasks. Problem is Algoriddim opens in fullscreen on my primary screen and there is no way to drag it to the second screen.

Nor is there an obvious way to get it into windowed mode and drag it across.

I get around it by setting up my second screen as my “primary screen”, but there are some programs I want to open and they only open as full screen on my primary screen too and I am stuck being unable to use both simultaneously.