Unfortunately, I only know how to use the built-in screen recording features on macOS. I’m sure Windows has something similar and someone who has experience with this will be along shortly. Or you could do a web search for windows screen recording, but I’d be careful with random third-party apps. I seems to remember there was a bit of a scandal not too long ago where some popular screenshot thing turned out to be spyware.
Best to get a recommendation from someone who knows what’s legit. You could absolutely do it with OBS, but that seems massively overcomplicated to me.
Ooh - I can actually help with this one There’s a thing for Windows called ScreenRec. It allows you to draw a box around the area of the screen you want to record (so if you want 2 programs to show, or just a section of one) and you can do sound or no sound. Let me dig up the enabling instructions (since it’s been an age since I did it)
I use OBS Studio. The recording stuff with Windows doesn’t show when I click on menu items in programs, like if I’m trying to record Inkscape, and show where to find something in the menu, like Union-they can’t see it. OBS Studio is free and captures your entire screen, so drop down menus and whatnot aren’t an issue.
One more thing to check is that your video card software might have the option to screen record. For example, mine comes with Radeon Software, and has that option. It is normally used for live video game streaming, but I have used it to record desktop video before!
Yes - it’s awesome! And you can choose to show yourself or share the screen at various times, etc. It’s like having an audience but then you can download and edit the video and remove the bloopers (at least that’s what I have had to do LOL)