I can't get the call controller to work. Shift-right clicking with an unlinked device linker just shows two red dots that I can't seem to interact with and shows "Edit Mode: True." Am I doing something wrong?

try updating the the latest version for 1.15.2, it has more proper icons for that instead of the red dots, as well as fixes some interaction issues

If this issue still occurs for 1.15.2, please re-make in https://github.com/Thuts-Mods/ThutTech/issues