I can confirm that I also have this problem with Excel on Microsoft 365, and it's probably been happening for a couple of years though the quirks related to Excel seem more prevalent. The extra blank tab always occurs, but on my multi monitor setup there's a lot of weird stuff that happens like: When opening a second file from file explorer, it will shrink down a full screen window, and sometimes move it to a different monitor If I have multiple windows open, and then
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