You may have the "Easy Mode" enabled on your Samsung Galaxy S5, which causes very large icons on the home screen and menu. The symbols are then displayed in only three columns and they only show the most necessary functions and settings.
The Easy Mode is a graphical interface of Touchwiz and shall help users to find their way with Android. Especially for newcomers to the Android world, this feature is very useful. We want you to show how you can shrink the huge symbols of the Easy Mode back to default size and activate the normal mode.
Scrolls on the Homescreen to the next page and tap here on the buttons:
"Simple Mode" -> More Settings -> section "Personalization" -> Simple Mode
Set here the highlight to "standard mode" to return to the usual Touchwiz on the Samsung Galaxy S5. Ready! You know now how to disable the large symbols of the easy mode on the Samsung Galaxy S5 and return to the standard Touchwiz.