Most door families will use linework, not the modeled door panel, to represent the door and swing in plan. You'll need to go into the door family and add a masking region that moves with the door lines so it blocks out the floor pattern.

While you're at it, you may as well create a door swing locked to a reference line so you can control the angle. All Revit doors are set to 90 degrees, while I prefer to show them at 45 degrees. With an adjustable door swing made of linework and a masking region (if you want it) nested into the door leaf family, you can make the angle anything you want.

Thanks for the advice. I have tried to edit and modify the door family with only marginal sucess. The door already has parameters to adjust the door swing in plan view. When I apply the masking region to the door, I am only able to lock it to a couple of the faces. The other elements whicha re part of the door swing do not allow me to lock the masking region to it. I get the attached error. I sort of works when the door is opened to 90 degrees, but stays at 90 when I change the door swing. I have just dabled with families and clearly I need to spend more time learning this animal. Any resources that you can direct me to in order to help with families would be appreciated. Thanks again for all your help.

could be anything. Can you post the door family? We may be able to figure it out, then let you know.

Here is the door family...

If you're using a filled region, the align/lock to the reference line (that's controlled by the angle parameter adjusting your door swing) also needs to be dimension locked to the parallel face of the panel, and the ends of the panel will also need to be locked with a 90-degree angular dimension (at both ends of the sketched line) to both of these. If you do this all in the sketch, it keeps the view of your family a little cleaner... but...

As you can imagine, that's a lots of locks to keep on top of. You'd do well to look at using a detail component for this kind of thing - that way you have control over that element "there" and simply place it as required, in the door family.

After discovering this, it seems like the place to add this masking region, but not sure why this did not work. Thanks for your help in trouble shooting this.
Thanks for the suggestions. I have played with this with marginal success. First I tried applying the masking region to the door swing and locked to faces to the two swing reference planes using align. I am not sure what the dimension lock to the parallel face meant exactly, but I dimensioned the masking area and references the parallel faces to the door width and the door thickness. I then applied the 90 degrees angle locks on two corners. I loaded this into the project and it would still not rotate. I tried this both when the door was open to 90 degrees and 0 degrees. Subsequently I discovered that the door swing itself was a referenced in family and tried the similar procedure in the door swing library - I thought this would do it, but when applying the masking region here appeared to have no effect when the finished library was loaded into the project - no masking at all. I am attaching a screen shot of the door swing family and am attaching the family itself.

Be aware that masking regions are on the Category and not a Sub Category. This means you cannot selectively display it off while leaving other door components on. I made a beautiful door with a masking region to obscure the floor tiles, however the masking region turns up in my ceiling plans obscuring my ceiling tile pattern.
My ceiling plans show the door opening and frame only, not the door or swing. So now I just live with simple line work for my door panel in plan.