@raed I just tried using my mover script to move the button out via javascript instead of CSS. Suffice it to say this makes vivaldi very unhappy and causes a soft crash. I'm guessing because it has to look for this element on each tab change to update it's status (is the current page bookmarked).
Moving this will probably require some deeper investigation / some sort of CSS hack involving placing it on top of elements and using padding. Something akin to
#main > div.toolbar-addressbar.toolbar > span.extensions-wrapper {
margin-left: 50px;
}
#main > div.toolbar-addressbar.toolbar > div.addressfield > div.add-bookmark-container.addressfield-popup-container {
position: relative;
left: 50px;
}