In Windows 10 there seems to be a feature, still under development called Windows Sets. https://www.howtogeek.com/352109/how-to-use-sets-in-windows-10-to-organize-apps-into-tabs/
While MS pulled this feature from the latest public builds of Windows 10, it looks like it’s not dead, but sleeping, due to make a comeback once issues have been ironed out. https://www.theinquirer.net/inquirer/news/3081852/windows-10-sets-coming-back-rumour

If this is the case then it would be the perfect way to bring make MDI like functionality to Excel for those users who miss it. Certainly from a Excel custom Application perspective MDI windows worked very well.

It would be great to have a setting in a future version of Excel such that by default Excel would tab all the Windows together that made up each process. This would nearly give the effect of an MDI application, as the key issue for some Excel Applications is determining which Excel Windows belong to which Excel process.

This idea combines a host of ideas which all call for similar functionality. The individual postings score minimal votes but together they add to 75 votes. I raise this to combine the feature requests, so that it gets prominence as I would dearly like to see this addressed.

Features for the Header / Footer:
1. include variables based on a cell reference
2. more than one Picture and Shapes
3. Print and save dates
4. Number of pages of the sheet and of the workbook
5. Add file properties (quick parts in Word)
6. Option for the header/footer on the first page only
7. Watermarks

I think Malcolm in the following post describes the mechanism the best:
https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/18633517-enable-headers-and-footers-to-include-variables-ba (26 votes)

Here is a list of all the similar feature requests which this post aims to roll up and bring to the forefront. I will post the link to this post, in each of these below, and ask people to vote again to see how many votes we get.

(15 votes) https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/20305687-i-need-more-options-and-control-for-excel-headers
(7 votes) https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/10894572-header-and-footer-like-word
(5 votes) https://excel.uservoice.com/forums/304933-excel-for-mac/suggestions/11306457-allow-option-for-header-on-the-first-page-only
(5 votes) https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/18572680-header-and-footer
(4 votes) https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/34267315-being-able-to-change-the-date-format-in-the-header
(4 votes) https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/32559508-using-various-dates-in-header-footer
(3 votes) https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/36516010-provide-access-to-fields-like-savedate-like-in-m
(2 Votes) https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/34715779-we-don-t-have-options-to-add-border-line-in-header
(2 Votes) https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/20015278-ability-to-easily-add-custom-properties-to-cells-a
(1 Vote) https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/39756547-including-a-tool-to-make-to-number-pages-within-a
(1 Vote) https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/39439864-possibility-to-insert-quick-part

Hope this is helpful.

Power Query allows Get from Folder from a local file system. If we are using Onedrive, we have to first map the folders to that local file system. We cannot directly enter the URL of the Onedrive folder as an https URL.

This would avoid the problem of having queries break when the local file system is different between, say, my work and my home PCs. EG the work folder may be C:\Users(work userid)\Onedrive - (my onedriveID)\folder name. But my home folder is C:\Users(home userid)\Onedrive - (my onedriveID)\folder name.
I'd be happy to use "try Folder.Files (work*) otherwise Folder.Files (home*) but that does not work.

Having Power Query fully support Onedrive would seem to be a simpler solution.

We would like the ability to disable the recently added Dynamic Array Functionality.
According to our in-house testing, Office 365 Version 1910 (Build 12130.20272) is the first build to include the Dynamic Array functionality. This new 'feature' basically broke the way our business has managed and shared large spreadsheets made up of calculations consisting of figures from various external links.

For example… In Excel versions prior to the build listed above, when a user with access to the linked data sources opens one of these spreadsheets, the calculations will update including data from the external links. Once said spreadsheet has been saved/closed, when another user opens the same spreadsheet that doesn't have access to the external data links they will receive a prompt asking if they want to update the links, after clicking 'Don't Update' the spreadsheet will show the last calculated figures in each cell. This is how is it has always worked for us.
Since build 12130.20272, when a user that doesn't have access to the external data links opens one of these spreadsheets they will receive a prompt asking if they want to update the links, after clicking ‘Don’t Update’ the values in all the cells with calculations will change from the previously saved values to #NAME? We also noticed the addition of the @ symbol in the formula strings.
I have logged this with Office 365 Support and they cannot help as they say it’s part of a major code update. I have rolled back to Version 1909 (Build 12026.20344) and disabled updates but this is only a temporary solution.

Hi

See screenshot. I'm in a cell with the value 26 112. I want to know if this is casual wages or PAYE and it's not obvious, I have to strain my eye a bit and make sure I follow the cells correctly. Same thing if I want to see other numbers in the same column as the 26 112. If I want to see a number that's15 rows up on the same column, if there's a lot of data, it's really difficult to follow.

So, it would be great if you had a view that highlights all info in the row and column your cursor is in - like the screenshot, maybe a light colour background change, just to help put numbers in context - my yellow highlight is too bright, light grey will be fine

This will save time of thousands of accountants worldwide!