How to remove lock symbol in recent apps Xiaomi RedMi 1S?

Issue:

When trying to clear RAM space in Redmi 1S there are times you will see lock symbol in the app. It looks like below image.

Here you can see there is lock symbol in my Camera app.

Solution:

Lock symbol denotes that it will not be cleared when tapping the clear button (the brush icon). To remove the lock symbol just swipe down the app. In my case I will just swipe down the camera app to remove the lock symbol.