Lock an app in recent screens menu.

[MinhazKP]

I wanted to lock a app which if we clear from recents menu also it should be excluded.

[DINKAR_A34_5G]

Enjoy.

[NOMAĐ]

What you require is pin app..
Once you enable this, you'll need authentication to unlock..

[vinayshah]

Even with "keep open" option on, if u go to that app and press back button to come out of it, the "keep open" option turns off automatically.
IT'S A BUG.