For me it was Fallout 3. I played exclusively on console growing up but after seeing a video on YouTube about custom player homes I felt like I needed to give it a try.

Fallout 3 did allow the player to theme their house but if you really wanted to fully decorate it to have a lived in/cluttered look you had to drop items out of your inventory and make them kind of awkwardly hover in front of you. If you wanted to rotate them you’d have to carefully push it against something like a shelf until it was oriented how you liked it and hope you don’t knock anything else over while placing it. Having things kind of welded in position or pre-placed was a big time saver.

The photo attached is from the Underground Hideout mod. It was one of the first mods I installed.