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i dont use vivo but i dont think this have a built-in app for locking/hiding photos. in that case, u can head to play store and search for an app that allows u to do that. u can try researching in the internet wc apps are reliable or have positive reviews, theyre easy to use too   1 reply

well even i use vivo smartphone u cant really lock your whole pic gallery but u can put the pictures in the file safe .You can find the file safe in the file manager app which will already be in your phone...   1 reply

Try downloading app lock in your play store/ app store, or some antivirus apps usually have those app locker(๑•̀ㅂ•́)و✧   1 reply