how to secure zalo information

Instructions to block friends from viewing logs on Zalo
to set up privacy on zalo, we can block strangers from viewing photos, commenting or you can also put friends on the list to block any information on zalo personal page.
Instructions for setting privacy mode for Zalo account
the security of personal information of social networks or chat applications, texting like zalo is something that anyone is interested in. so how can i strengthen the protection of all personal information on zalo?