There is another alternative that's you might find it useful.

Goto the URL opera://flags/#sidebar-site-panel, enable the flag, restart Opera, click the 3 dots at the bottom of the sidebar, scroll down to "Custom Site Panels" and add panels for opera://settings/system and opera://settings/passwords etc. Then, you can jump to specific settings via sidebar panels.

There are 2 downsides to that way though. One is that each settings panel will have the same gear icon. So, you'll have to remember which one is which or hover over them with the mouse to see what URL is used for each. The other is that you'll have to make those panels pretty wide to see the settings because they're on the right-side of the settings page.