When you inadvertently disconnect the workbook Windows from the Excel.Here we have listed some most common causes of Excel sheet tabs missing. There are numerous things that will make your Excel sheet disappeared. In order to solve the mystery of Excel tabs not showing problem let’s first find the answer to why are tabs not showing in Excel? After then follow the workarounds to fix the Excel missing sheet tabs issue. The missing Excel worksheet tab issue mainly generates when sheets may get hidden in plain sight due to some changes in the Excel setting. Normally, within the Excel workbook, you will get several tabs along with the bottom of the screen.