If you hit "stop measurement" it will freeze the white RTA line, you can then also hit "stop analyzer" if you want the red line to stop moving around too. You can resize the RTA window to suit, as well as move it around. If it defaults to full screen, just double click the top bar/title bar and it should go to resizable mode. It will remain over the top, so you can resize it and move it to a point that lets you see it and work on the EQ at the same time.
You can also take a snapshot by right clicking one of the memory buttons along the top.
You can also hit the Set EQ button, which will set the required EQs for you if you want to copy the RTA curve preciseley.
It's also worth giving the Auto EQ option a try - similar to the Set EQ function, but continuously takes measurements and makes adjustments to the selected channels automatically until it nails the curve. Skizer has posted a video about it, and how to use it which I found really helpful:
https://www.caraudiojunkies.com/show...kies-Exclusive