I am running Office 365 on a Windows 10 machine. I recently moved over from Macbook, but this does not appear to be a MAC vs Windows issue since a coworker has a different experience with what I'm doing. There must be some option selected in my excel.
The issue I'm having is when a group of cells are merged, let's say A1 through C1, if I want to select column A for deletion or editing, excel will not let me. It will automatically highlight columns A - C. If I double-click I can select a single column, but as soon as I right-click to delete or make another edit, it will select columns A through C.