
This node doesn't work when you're trying to connect color texture to its sockets. I think it's a legacy node.
Adding the range node with when navigating to Add → Textures → Operators → Range gives you the proper node.

Please fix the search function to give the correct node. I prefer the search for faster workflow.
Also, please make the sliders for Input Min/Max and Output Min/Max to work in the soft range of -1 to 1. Currently, it's -10000 to 10000. It's extremely difficult to control values within such huge range when you need to work mostly withing a narrow range of -1 to 1.