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i am confused how do i change it back to 1 second
Zoom in on the timeline is all you have to do.
There are several ways of doing it: Pressing the +-key on the keyboard is one, using the scale slider in the timeline is another.
For some years now the +-key is not mapped by default if you have a non-english keyboard. Go to Edit > Keyboard Customization and map Zoom In to your desired key.
Using the Scale Slider to Zoom the Timeline in Adobe Premiere CC 2015 - YouTube