If you are using the online version of Outlook, you can delete the email search history (useful if you have privacy issues) or export it (useful for finding old searches or data analytics). That's how it's done.
Most users of Outlook.com should now have a modern look and feel for their email account, which by default has a blue bar.
If you still have the classic version that many enterprise versions (the work e-mail provided by your company) still use, the default one is black Bars are displayed.
In both cases, the process is generally the same, but the location of the settings is slightly different.
Working with the search history in the Modern Outlook.com view  In Modern View, click the gear, and then click Show All Outlook Settings.
Go to the General option and select" Privacy and data "on the right.
<img class =" alignnone wp-image- 411916 size-full "data-pagespeed-lazy-src =" https://www.howtogeek.com/wp-content/uploads/2019/04/x4-Privacy-and-data.png.pagespeed.gp+jp+ jw + pj + ws + js + rj + rp + rw + ri + cp + md.ic.3ajbtAKDJg.png "alt =" The "Privacy and data" option width = "377" height = "26Arrrg =" / pagespeed_static / 1.JiBnMqyl6S.gif "onload =" pagespeed.lazyLoadImages.ofvisibleAndMaybeBeacon (this) "; 19659003] On the right side is the" Search History "section with the options" Clear history "or" Export ".
To export your search history as a .csv file (comma-separated values), click "Export." Depending on your browser's download settings, the download will be either in Your standa downloaded rd file If you want to save the location immediately, or ask if you want to save or open the file.
To clear the search history, click Clear History. A confirmation dialog box prompts you to confirm deleting the history. 
If you are sure you want to clear the search history, click" Next. "Unlike deleting emails or tasks, you can do not undo this step. If you are sure you want to clear the search history, click Next.
Working with the Search History in the Classic Outlook.com View
Click in Classic View the gear and then to "Mail."
Expand the general option and click" OK. "
On the right side you will see the section "Search History" with options for deleting ete history "or" Export ".
To export the search history as a comma-separated values (CSV) file, click Export. When you download the settings for your browser, the download becomes either immediately on your default download path, or you will be asked if you want to save or open the file.
Click Clear History to clear your search history. A confirmation dialog box appears. You are asked to confirm that you want to delete the history.
Click Next if you are sure you want to clear the search history. Unlike deleting emails or tasks, you can not undo this step. Click Next if you're sure you want to clear your search history.