Issues with the offset tool

I’m trying to draw a floor plan and when I draw one line for an interior wall, select it, and try to use the offset tool, it selects the floor and offsets it. What do I need to do to just select one line and offset it?
Whenever I select the line, then choose the offset tool, the line is no longer selected?

You cannot offset one Edge, you can move or copy one edge, but offset is designed for multiple edges.

For example.
GIF 25-03-2024 3-18-36 AM

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