When recording demos, it’s often helpful to write and draw on the screen.
ZoomIt
Microsoft has a tool that works for static screens, but not live:
https://learn.microsoft.com/en-us/sysinternals/downloads/zoomit
...
This seems to be a part of Microsoft’s “PowerToys” https://apps.microsoft.com/detail/xp89dcgq3k6vld?hl=en-US&gl=US
EpicPen
I also I’ve used EpicPen, which is functionally similar to ZoomIt but needs a license. Furthermore, EpicPen seems older software. ZoomIt does have more features, but I don’t use those. However, having the drawing remain on the live screen is rgeat - as of March 2025, ZoomIt needs to zoom in first to allow live drawing.