dark boxes showing on screen

[Naaveei]

Dark boxes showing on screen when calling to someone.

[SandeepDdn]

go to setting > accessibility > vision > show button shapes > disable it

[admin_]

Thanks for being with Samsung and sharing your concern. We would suggest you to navigate to Settings >> Accessibility >> Vision >> Disable Show Button Shapes and check the issue. Be sure to hit ♡ when you find an answer that works for you.
For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/