Since when MIUI 12 Quite a few users have complained about the problems it brought on the devices. In this article we have briefly seen what is the most common bug among all the smartphones of the brand, we advise you to take a look at it. But it's not all black, let's be honest. After all, Xiaomi's custom skin is complete with everything ...just a little unstable. But while all the devices are slowly receiving the update, news of the return of a highly requested feature: the mobile data bar on the Contro Center. This had disappeared in the transition from the 11th to the 12th version.
The use of mobile data on MIUI 12 is returning: the Control Center will reinstate the feature that disappeared after the abandonment of MIUI 11
Inside the Control Center of MIUI 12, that is the drop-down menu that is lowered by swiping from top to bottom, now the bar that told us is no longer available how many GB of mobile data we used every day. This is a gray or black bar positioned just above the brightness bar in the previous version of the interface. It was undoubtedly a useful feature as it allowed monitor the amount of mobile data used. According to reports on the Mi Community, the bar in question is about to return. 
Of course, even on this version it is possible to have a similar tool but only in the first four bubbles on top. With the previous build, however, the mobile data usage bar was always present and above all immediately visible. In any case, as revealed in the next update. We are clearly talking about ROM Global and not China, so aficionados of the feature can breathe a sigh of relief. For the moment we are not aware of when this feature will return, but it will undoubtedly be well received by all users.
We take this opportunity to remind you of salways report bugs that you find on the skin so that developers can correct errors.
Source | Mi Community
Through | PiunikaWeb
When the update arrives on the redmi note9 pro version 12
There are no dates I'm sorry
To me personally it gives the impression that it "sucks" battery. My opinion after two days of use
https://www.xiaomitoday.it/miui-12-battery-drain-testimonianze.html
Yes, unfortunately you are not the only one who has noticed this thing.
To tell the truth, I have my 10 lite with MIUI 12 and that function is there
Do you have the bar like on MIUI 11 or the bubble? And what MIUI do you have? Global, EU…?
I never put the bubble because I prefer normal toggles, and therefore I have the bar as on miui 11 with the data consumed during the day and the data for the current month. version of miui it says miui global 12.0.2.0 (QJIEUXM)
ou se trouve cette barre ou cet icons SVP ?