Why does Chrome automatically expand when I use it on my MacBook?

I use Safari for most things, but for various sites find Chrome does better.

On my iMac running Monterey, I can use the wonderful Tile feature with Chrome on one side without a hitch.

However, on my MacBook running Monterey, every time I use Chrome as a tile its window expands to full screen when I hit <return>, rendering the tiling feature useless.

I queried the Chrome community with no luck. They said ask Apple.

Anyone have a clue?

Thanks,

Rob