I accidentally did something that causes my tool bar's tool to be humongous. I can't use the tools efficiently anymore, the tools themselves are so big that you need to scroll down a fair amount to get to a specific tool. I know that with Krita 4.0, you can rescale your brushes icon, I did not know that you can also scale your tools. I try resetting Krita by going to %APPDATA%\Local\kritarc and renaming the cache file (I could not find the kritarc file). My last resource is to uninstall and reinstall. Any help is appreciated.

Uninstall and reinstall will never help you. It will not change the settings. You could use Windows Explorer to search for the kritarc file, of course, but it will be easier to just right-click on the toolbox and select a smaller icon size.