How to search email in outlook across all folders? - Use "All Mail" from search toolbar

Do a basic search in Outlook 

option + command + F brings up search panel.

Under Search tab you will find "Current Folder","Subfolders","All Mail" and "All Items" and so on.

Click "All Mail" and perform search now.


Source https://apple.stackexchange.com/questions/378292/outlook-for-mac-searching-only-the-current-folder
https://support.microsoft.com/en-us/office/find-items-by-doing-a-basic-search-in-outlook-for-mac-53b60f65-25b7-4582-9c5e-4adf16e503a1?ui=en-us&rs=en-us&ad=us