Can you "shorten" the light strip in software?

Hi all, I currently have a 55" TV but want to upgrade to 65" in the future so I want to buy the larger size Lytmi strip. Is there a way I can tell the controller to "shorten" the strip in the configuration software? For example it just doesn't use the last 6 inches (or whatever) when illuminating the strip or if the strips overlap a bit it will show the same colors on the overlapped portions.

What are the downsides of using a larger Lytmi on a smaller TV?

Thanks!