Thank you for the answer.
I noticed also that front of each bookmark (on the right side of the bar) there is the address of the bookmark which shorter the title of the bookmark. For me, i don't like it, i like more to see explicitly the full title and secondly i don't like the viusal render. It is just my opinion.
I've switched from Opera to Opera GX because of its ability to configure the appearance of the interface but why in the adanced configuration it is impossible to move the luminance "L" cursor which would have been perfect to give the right render? And why this cursor is displayed if we can't move it?
So, my advice / request, please make this cursor active and allow users to change the font and its weight for the bookmarks bar and subsecantly to adjust the width of the bookmarks sidebar.
Thank you.