Unfortunately, the Always on Display (AOD) feature is only available on Samsung phones with AMOLED screens. Since the Galaxy A11 has an LCD screen, it doesn't have an AOD feature. You can still personalize your lock screen, even without the AOD feature. You can try Dynamic Lock Screen or setting a video lock screen on your phone. Here are the instruction for these features: https://www.samsung.com/in/support/mobile-devices/set-up-dynamic-lock-screen/
