excel question

i can’t believe i can’t figure out how to do this. it’s really just a formatting issue. basically, my excel has somehow stopped showing all of my open files in the windows taskbar. the only way i can go from workbook to workbook is through the windows function at the top of excel (as opposed to just alt-tab). at first i thought it might have been something i did to the taskbar itself, like clicking the “group similar taskbar buttons” box, but that istn’t it. thoughts?

Tools->Options->View->Windows in taskbar

wow. so easy. i have no idea how i unchecked that box. thanks.