How to change the selection of the size options

Store Design
, ,
1

in the product page I want to change the selection of the products size to be viable for both size S-M and L-XL

not like the same here

here my store link: https://b6448a-44.myshopify.com

IMG_8176.jpeg
IMG_8176.jpeg1170×1859 99.1 KB

2

Thank you for your time , i want the size options to look like this

IMG_8177.jpeg
IMG_8177.jpeg1170×658 16.2 KB