I think the 9 x 12 would work if you put the chair & side table on the opposite side of where it is now. They would sit partially on the longer side of the rug. I looked at your prior post back in 12/19 when you asked about additional seating. That post has additional pics of this room - the other 3 sides we can’t see in this post pics. The extended or longer side of rug would be in the wide entry path from kitchen, right? Looks like plenty of room on that side to put the brown leather chair & its side table over on that side with the chair back to french doors. That’s the longer side of this room, right? The other side is the pathway to get to the stairs which is the reason for the slanted wall, yes?

ETA - it’s easy enough to do a mockup of the rug & new placement for chair. Tape off the new rug size & move the chair & table with front feet positioned on the rug the same amount the sofa front feet will be on the rug. Walk around it & see how the room & walkways feel.

Thank you! This is really helpful!! I will try that!!