You have the option of what applications will show the pin. Right click on an item and you can choose if this is global or app-specific (in this case dolphin, b

You have the option of what applications will show the pin. Right click on an item and you can choose if this is global or app-specific (in this case dolphin, but you can indeed pin per app!). The file open dialog is likely the "portal", which works securely across sandboxed applications. Every Linux does have a portal implementation. In KDE this portal has quite some features, but it could be that some are not available, possibly spec-related or security concern. You can look in the settings though. EDIT: pinned items are available in the desktop-portal. I have not looked into breadcrumbs, but I like the location bar to be editable straight away anyways.