When the monitor cursor is a white square it means the plugin failed to load in the icon image, to resolve the issue please follow the following steps.

If you installed the plugin with the mod manager please make sure you've installed at least version 1.0.1 of the plugin.

If you installed the plugin yourself, make sure the plugin folder is called "TheDeadSnake-Touchscreen".

If you followed either step above and it still does not work, start the modded version of the game and look at the console. When the plugin starts up and it could not find the image it will print a warning to console:

[Info   :   BepInEx] Loading [TouchScreen 1.#.#]
[Warning:TouchScreen]  > Unable to locate hover icon at path: <Path>\BepInEx\plugins\TheDeadSnake-Touchscreen\<IconFile>
[Info   :TouchScreen] Enabled TouchScreen

Make sure the path matches the location of where your icon image is located. If all of the steps did not fix the issue or there is a error instead of a warning, please open a new Issue and append the console output to it.