Considering how limited our options are with no root availability, you can still try a different luncher like NovaLuncher from play store. It gives you more options to customize things, but I didn't try to see whether that particular option is there to be modified or not. Let us know how it goes.
Sent from my SAMSUNG-SM-G900A using XDA Free mobile app
If there is a problem, then there is a solution.
If I helped then please hit THANKS