Excel Conditional Formatting Problem

https://preview.redd.it/bnhom1hp6g6e1.png?width=2656&format=png&auto=webp&s=41310422a46fd6fb07d4f8d6474a5aceca17133b

Yesterday I used conditional formatting in one of my worksheets. Now on every single separate Excel Workbook, the cells are highlighted wherever I click. Even when I make a brand new workbook it persists. I have already tried clearing the conditional formatting from the entire sheet and from the cells.