Hello Thierry,

I often get a shift down of my grouped buttons, as shown in the following image.
I can not use one of the existing properties to correct this offset.
Only solution found: expanding the size of the group via CSS
Other tracks ?
thanks in advance

After width: max-content

Width of buttons in group is defined by Bootstrap CSS, you can only play with CSS here.

if you are happy with your CSS trick, I can't suggest any better solution.