Hi Martin,
Thanks for reaching out. I understand how having the entire subtotal row bolded would make reports clearer and save time when reviewing grouped data. I'm here to help!
First, the current design only bolds the subtotal cell in the first column, and this is intentional in the latest Excel versions. However, many users agree that extending this to the entire row would improve readability.
Second, while this feature isn’t officially on the roadmap yet, there are practical workarounds you can use today. One option is to collapse the outline to show only subtotal rows, then use “Go To Special → Visible Cells Only” and apply bold formatting across the selected rows. This is quick for occasional use.
Last, if you want a dynamic solution, conditional formatting works well. For example, apply a formula like =ISNUMBER(FIND("Total",$A1)) to your range and set the format to bold. This will automatically highlight rows containing “Total” or “Subtotal.”
I hope you find this information helpful. Please let me know if you have any further questions If the answer is helpful, please click "Accept Answer".
Regards,
Carlo