Be able to filter information in the chart, similar to what exist on windows.
Example attached(image)

Provide a way to create a Venn diagram so that the circle sizes approximate the different magnitudes of the data items. When they are all the same size, you can only see relationships, not the importance of them.

As of March 2020, I can change the order of data series for a chart either by using the arrow buttons in the Chart Source Data dialog or by changing the order value in data series definitions in the formula bar; but (at least for line charts) this does not alter the data series order in chart legends.

Search results for "change Excel chart legend data order" indicate the Windows version matches the legend data order to the chart data order when changed, as it should. Need to do that for the Mac version, too.

In the "Add or remove a secondary axis in a chart in Excel" support page (MacOS version) in support.office.com Word is erroneously used instead of Excel, confusing the poor reader (All languages!).

In Excel 16.34 (Office 365), when working on a chart, the Menu option Data\Chart source data is not greyed out when nothing is selected, which is confusing

In Excel 16.34 (Office 365), when working on a chart, the Menu option Data\Chart source data is not greyed out when nothing is selected, which is confusing

When opening a worksheet created and/or opened in a previous version of Excel, any charts are re-sized and moved within the worksheet. Given that there is no VBA user form support (amongst other features) in Excel 16.3x I frequently move between the two versions. Having to re-format every chart when changing versions is a huge pain. Thank you

When creating a chloropleth map chart based on European Union data, we cannot set the map area to 'Multiple countries/regions'. We only have the options 'Automatic', 'Only regions with data' and 'World'; 'Automatic shows the world map.

If the data point for Cyprus is removed, we are able to set the map area to 'Multiple countries/regions' and show Europe only, including countries for which there are no data. This suggests that Excel maps do not consider Cyprus to be part of Europe.

As Cyprus is a member of the European Union, please update the map so that Europe includes Cyprus.

Make it possible to manually order data in sunburst diagram. As it is now, it is completely useless for several applications, such as year-wheel. The months are rearranged based on their size rather than chronologically.

create a checkbox option that is:
- bold to read (visually striking instead of utterly subtle as it is now. see google sheets for example)
-easy to insert
-easy to copy and paste across columns/rows
-automatically centres in cell
And, it would be fantastic if Excel preserves the checkboxes from GoogleSheets instead of turning it into TRUE FALSE.

Following the help instructions for secondary axis is useless, because the menu does not contain Secondary Axis until you've added one. The only way to do it is to right-click on the series and choose "Format Data Series...". At least please fix the help, but even better would be to fix the menu item.

It is nice in a column chart to see meaningful pictures instead of boring bars. Mac only allows you to import an image. Windows supplies a library of icons making it easier and more robust.

Previously, there were ways to program custom keyboard shortcuts to insert different charts. In Excel for Mac 16.30, there is no way to do this. For those of us who make lots of charts, this is very difficult. Even making it possible to change the default chart so that the new alt + F1 command can be used would be a big step forward.