add "activate sheet" from list of sheets functionality
In the desktop app, right-clicking the "next sheet" arrow will give you a drop-down of sorts to choose the active sheet.
This functionality is not available in excel online... I have multiple workbooks that have 50+ sheets to navigate through and it would be great to be able to have this functionality while using excel-online.
Shafiul Alam Chowdhury commented
This is very frustrating to see that Microsoft is not taking care of this essential functionality. This is very important who actually works with Excel. My organization needs me to maintain several Excel files that are uploaded on SharePoint and have more than 100 sheets in each of them! And I can't access them properly. :(