How many recent apps can be accessed using this functionality. I have noticed that not all the apps used/visited are shown. For example say i opened the calendar app in the morning and used/visited multiple apps during the day. Now in the evening if i look for the calendar app in recent apps its missing and happens with most of the apps that was accessed during the day. Didnt have this issue with my previous Sony (Z3)
I am almost positive that there are only a certain amount of resents that are stored. For some reason the number 25 stick in my mind but I could be totally off here. I haven't found any way to adjust this number either. But, most of the apps that I use the most are there so it is working.
If it were to keep all the apps you opened running in the background you would will lose RAM fast. So I'm guessing, with it's RAM management it shuts down apps that are idle after a certain time limit too. That and it's limiting the total amount running.