How can I change my icon size and unlock effect?

[Aivur]

my phone is samsung galaxy j2
yesterday i upgraded my phone by wi-fi. after there my unlock effect got change. the previous effect was like water drop. an the second problem is, the icon size of my phone got bigger. now i want to change like original

 

[B. Diddy]

Welcome to Android Central! They probably got rid of that animation with the system update, so it's doubtful you can bring it back. As for icon size, if there are no options in the system settings to change the size, then consider installing a 3rd party launcher like Nova Launcher or ZenUI Launcher.