How can I get the old OS back on my Samsung Galaxy S4 phone?

The Android 5 Lollipop OS is the worst I've seen. (1) It now takes much longer to review my emails as the "check box" for quick removal is gone. (2) The text selection is too broad, it's either tiny font or much too large letters; (3) In the Contacts section, Favorites now show pictures of in columns - Tiny letters, I cannot read the names & because the columns are so close together the names are truncated, which makes this feature useless. I'm a business person, I need a list that I can read, not a bunch of pictures of clients.
I use my phone for business, not as a toy to play games or tweet or text my every desire or movement. The pastel colored background makes some of the phone number hard to read.

I want to go back to the previous version operating system that I originally bought on the phone. This Lollipop version is useless to serious use.

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