Please find inline comments:
1.where is RAM usage status?
-> Please turn ON dev options from settings -> system -> About phone ->Build Number (press 7 times on it)
-> Now go back & find "Developer options" -> Memory -> check your RAM usage here
2.double tap on screen to lock and unlock?
->We don't have "double tap on screen to lock and unlock" gesture. However, we have double tap on fingerprint to lock gesture. go to settings -> search at top "gestures"
The path is: Settings -> language&input ->Gesture settings -> Fingerprint Phone Lock
3. double on fingerprint sensor was worked extremely amazing in previous version,in present OREO version it is not working properly
-> Please try adding new fingerprint & reboot
4previous version had an option to delete cache memory,in OREO where it is?
-> settings -> Storage -> other apps -> "tap on particular app to clear cache"
5.Google widget was not changed,why?
-> it's default by google. We did not disable it to give users pure android experience
6.how to change font style?, different font styles
-> not implemented, However you can change Font size from settings
7.Battery is also draining rapidly
-> please provide more info. We will look into this.