Once we are satisfied with the way the VIX hover and the VIX charts are in the straddle RV, i can also add the same in the calendar.
I prefer to do things steps by steps.
I use snagit personally but it's a paid tool and my preference.
For free, there is the Windows Snipping tool : https://support.microsoft.com/en-us/help/13776/windows-use-snipping-tool-to-capture-screenshots
You open up the Snipping Tool window, keep that window as the active window (aka click on that application title window for example), put the mouse where you want to hover on the RV chart, then use the keyboard CTRL+N, then select the area you want to screenshot.
After that you can write on the screenshot or highlight.
Pretty useful tool if you ask me.