To do Alt + J I E M on Mac in Excel, download and install Accelerator Keys, then press Option, followed by J, I, E, M.
Command: Medium Eraser
This is how to do Alt + J I E M on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + J I E m selects the Medium Eraser tool. This provides a medium-sized eraser that balances precision and coverage, allowing you to erase moderate portions of ink and drawings in your spreadsheet.