Step 1: Open Outlook email clieent.
Step 2: Switch to the Send/Receive option in the menubar.
Step 3: Click on Send/Receive Groups > Define Send/Receive Groups.
Step 4: Select the All accounts entry and click on Edit.
Step 5: Now, select Use the custom behaviour defined below and then uncheck the Trash folder under the folder hierarchy.
Step 5: Click OK.