You can delete exported videos from the homepage by following these steps:
Step 1: Click on 'You' from the left-hand panel
Step 2: Scroll down until you see the Downloads section and click 'See all'.
Step 3: Click 'Edit' to enable selection mode.
Step 4: Select the videos you want to delete - you can pick them individually or click 'Select all'.
Step 5: Once you've made your selection, click "Delete" to remove them from your account.