When I'm trying to follow the terrain tutorials on the site, there's a point in the tutorial that colors are sampled from an image to set up the ramp gradient. I've installed the SideFX tools and have the menu option, but when I select it, I'm not able to click and drag to sample colors. I've granted access to the Houdini Launcher and Houdini itself to record the screen, but there doesn't seem to be a mode change when I select the menu option.

Can anyone tell me what I'm doing wrong?

Thanks.