Via the Android app:
Check that you are logged in.
Tap on the icon consisting of three horizontal lines at the top left-hand corner of the screen.
Scroll down the tabs to “My Options” and tap on “Memory management” just below.
You can now see all the volumes you have downloaded on your telephone or tablet. You can select those you want to delete by tapping on the top left-hand corner of the cover.
Then tap on the trash can icon at the top right-hand corner of the screen to delete these volumes from your telephone’s memory.
Via the iOS app:
Check that you are logged in.
Go into your library by tapping on the icon at the bottom right-hand corner of the screen.
Tap on the “Downloaded” tab at the top right-hand corner of the screen.
You can then delete the volumes downloaded onto your telephone or tablet by tapping on the three dots at the top right of the tab for each volume and selecting “Remove from downloads”.
Repeat this operation for all the volumes you want to delete.
Via Nintendo Switch:
Go to “My comics”,
Then go into the “Downloaded comics” tab
Select the volume you want to delete.
Select “Delete"
Repeat this operation for all the volumes you want to delete.