Click the left side of the stopwatch floating on the screen to hide the bottom button.
When displaying the stopwatch on the screen, the record window is not shown when there is no record.
Allows you to move the position of the button that makes it disappear by dragging the clock on the screen.
Here's how to set up the widget:
On the home screen, press and hold the menu,
Then click on the widget and drag it to the desired location (depending on your device).