Configuring preferences and options in Outlook.com
Are you talking about the office dashboard thingy? It's a windows app - reinstall it from the windows store or repair it if you want it. (personally, I wouldn't waste my time - its useless IMHO - but is a small app so its not a space hog.)
The office dashboard is the black and orange icon - the icon group is the office apps (don't ask me why some icons are tiny). With Home & student, you'll only have word, excel, and powerpoint - plus at least OneNote app , if not OneNote 2019.