I can't enable this feature on my phone.How can I enable it..?

Today I had encountered one problem with my phone, after playing BGMI i just placed my phone on table and after sometime I tried to turn on the phone it doesn't showing anything on display ( just dark). When i tried to call, it is ringing but it show...

S20 fe 5g

After updating January security patch,data connection( call also) not good as earlier it is worst now. How can i fix it..?