I change my layout often. Nothing is permanent. I purchased three pieces of pegboard and use those as a base. They offer a good flexibility in how large I can arrange my layout and are very inexpensive. My last layout
Three Train Layout

Here is my first three train layout. Download the SCARM layout file here.
Double Track Kato Unitrack with Overpass and Reverse Loop

Download SCARM layout file here.
Easter 2020 N Scale Layout

I picked up the Kato V11 outside loop for Easter. Here is the first layout using it.
Creating Content N Scale

I made a new train layout and noticed many of the steps were similar to creating content for online teaching.
Three Table Oval

Download SCARM layout file here.