Multiple Excel sheets on one workbook.

I've been using excel for many years for work. The settings are always open each file as a separate excel window. I recently downloaded excel for my home use. And settings are one workbook for all opened files, like tabs (book1, book2, ect). I really don't like it , besides that excel crashes when I open multiple files. How do make settings to open each file in a separate excel window, so when I move mouse over excel on the taskbar I can see all opened files? Please advise.