I use my phone for private things such as social media and telephone banking. These apps that I won't want others to access if they had my phone and it was unlocked I have them blocked through App Lock.
However pressing the recent apps list (left touch button on Samsung s7) displays the list of apps and also gives a still image of what was happening in that app. I was advised Tasker can be used to resolve this by completely closing an app upon exit whether by pressing that event apps button or the back button or home button, so it no longer appears on recent apps list.
However Tasker is very complicated and I was hoping someone could share the wisdom of how this can be done.