How do you create a bar that slides in, stops and stays at that position when activated?

Question

How do you create a bar that slides in, stops and stays at that position when activated then only returns back to its former position or default point when deactivated?

Answer 1

https://code.sololearn.com/WdYEYe5OOVLe/?ref=app
https://code.sololearn.com/W91q8ysxorEp/?ref=app