With a little JS and CSS you can figure out the height of the window (the browser), and then figure out the height of the wrapper for the RG. Use the toolbox plugin to run some JS and calculate whether the height of the RG makes the height of the window taller than the window height. If it isn’t longer than the window height, fix the height of the page to 100vh. If it is, remove that class dynamically (using something like AddClass plugin), and if its shorter, add the 100vh defined class.
If you need some help doing this we could probably work something out. It’s not a huge lift.