CR and LF characters shown at the end of each line in Notepad++

Toggle the setting View > Show Symbol > Show End of Line

As Xenorose notes, Show All Characters should also be unchecked.

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In the menu go to :
view > Show Symbols
You probably have one of these checked: "Show end of line" or "show all characters" . Uncheck them (only one can be selected, deselect the one you have checked).

If you are seeing something like this (Block carriage return (CR) and linefeed (LF) characters after pressing 'Return' or 'Enter' key on the keyboard):

You can fix it by clicking the ¶ icon on the toolbar.