Let's start with the principle. When you are in the point of view (POV) of one person, you need to stay there, whether you write fiction or nonfiction. The tendency is to move outside the POV and become the observer of the action instead of the actor.
This shows when we use words such as saw, heard, observed, or noticed. Here's a simple example and the POV is first-person singular: I heard Allison sigh with contentment.
You have moved out of first person and have become the observer of the action. To remain in the POV, you would write: Allison sighed with contentment.
You couldn't hear the sigh unless you heard the sigh. If you tell readers you heard, you're no longer in the first person POV.
Here's a sentence in third-person POV: Anna could feel the floor shake as the opera chorus assembled on stage.
The writer jumped outside the female POV person and told us what Anna experienced. Better: The floor shook as the opera chorus assembled on stage. By describing what took place, readers are aware that Anna felt it.
Because I want to become an excellent writer,
I will avoid filtering.