You might need to tap Delete again to confirm your action. [1] X Research source

For iPhones, tap the Settings icon in the bottom right corner of your screen and tap Privacy then tap to disable Read Receipts. The slider icon should turn white to indicate the feature is disabled. For Androids, tap ⋮ in the top right corner of your screen and tap Settings from the drop-down menu. Then tap Account > Privacy and then tap to disable Read receipts. The slider icon should turn grey to indicate that the feature is disabled.