Blender | Bridging Edges to Add a Face Between Them
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- Blender
Prerequisites
Blender: v4.0.2
Contents
In vertex select mode, choose the vertices along the center line and press v to split them apart.
Then hold shift, choose the bottom half, and move it down with g.

Next, switch to edge select mode, choose the center line, and use Bridge Edge Loops to connect the faces.

The result looks like this.
