I see you found a solution. I’m going to add to it. The first 20 collections can be isolated in object mose. The order depends on how you have your collections ordered in the outliner. So top levels first. Then sub levels. The hotkeys are the numbers on the top row. 1 thru 9 and 0 for first 10. Alt+ 1-0 or 11 thru 20. Shift+ to toggle view instead of isolating. You can see the order and do the same thing through n-panel->view tab->collection panel. To isolate a collection click collection name. To toggle show hide click Eye icon. This combined with local(/) and show/hide(h, shift+h, alt+h) makes working on large scene a lot easier. Also when in local view. If you have an object that you want to remove from the local view you can select it and press m.
