How do I undo a filter in Lightroom?

How do I undo a filter in Lightroom?
The following steps are easy to go by:

Step 1: Access the History Panel.
Step 2: Browse History List.
Step 3: Click Desired Undo Action.
Step 4: Delete Undo History.

The following steps are easy to go by:
  1. Step 1: Access the History Panel.
  2. Step 2: Browse History List.
  3. Step 3: Click Desired Undo Action.
  4. Step 4: Delete Undo History.