Similar to other browsers, it is helpful (for me at least) to have a long search bar that allows me to see full links. This could be integrated as a setting in "Customise Toolbar" where u can swap out this search bar for a 'long' one. This long one will act as 'Flexible Space' does. Or somehow adding the 'dragging' that is used for app windows to resize.
1
Longer Search Bar Settings