It would be nice to have this, don't know if it still for the moment or if there is any way to add ti. I use Opera GX and don't have the option to do it.
@endosana I definitely agree with this one. Sometimes, it's actually hard to even tell whether the chevron arrow is active or not due to its light on lighter colors. Somewhat in the same manner, the scroll bar can be hard to see but there is an extension to adjust that.
There's a workaround. You can add Bookmarks to Speed Dial and get access from there with one click.
"Add link" would not work, but if you edit an existing link (click on the 3 dots and Edit) in Speed Dial and change the url to opera://bookmarks/ that would turn it into Bookmarks.
Otherwise right click on any empty space of Speed Dial and click Bookmarks.