Click on the Start button in Windows, then search for and select Control Panel.
In the Control Panel, select Programs, then Uninstall a program.
In the list of installed programs, locate Secure Exchanges.
Right-click on the two files shown in the image above, then select Uninstall.
To uninstall Secure Exchanges on Gmail, right-click on the Secure Exchanges extension installed in Chrome or Microsoft Edge. You will see the option "Remove from Chrome" or "Remove from Microsoft Edge". Click on it, and Secure Exchanges will be uninstalled.
To remove Secure Exchanges from Outlook Web or New Outlook, you must go through the Microsoft Admin Portal.
Go to https://admin.microsoft.com/ with an administrator account.
In the left menu, click on Settings, then Integrated Apps.
Find Secure Exchanges in the list of installed applications.
Select Remove and confirm the operation.
The removal process may take up to 24 hours to be fully effective across all accounts.