Samsung

How is it not working? Is it not showing the prediction bar to you above the keyboard?

I have faced some animation stutter issues on Android 10 but no major issues like you have reported. Probably try safe mode and see if the issue persists? The last resort will be a hard reset.

You can enable it from advanced settings. If it is not there, it will most likely not be in the future as well.

You should monitor your battery stats via an app called Accu Battery. Monitor it for a few days to see actual stats to know what battery timing you are getting and the apps that are consuming more.

For seal?