The reddish one is Mars and the bright one just after sunset or just before sunrise on the horizon toward the sun is Venus.
Typically planets dont twinkle like stars, or so i was told in school. They have a steady light. I still do not know why, though. 😀
Now about the alignment. I doubt whether we can see them in a straight line because Venus and Mercury have an orbit smaller than ours and the rest are after the earth. Now how can we possibly see all in a straight line!! They are on opposite sides of earth, right?
Ok, just checked the net. Link here:
https://www.cnet.com/science/how-to-see-january-21-planet-parade-six-planets-in-alignment
This answers your question I guess.