I can do Windows testing but need help from a couple users to look at a feature in Linux and macOS
There are GTK options to use file location box instead of breadcrumbs in the File Manager dialogs.
Some time ago, the wiki added a line listing in the Handy Shortcuts section of the keybindings page for toggling between the breadcrumbs and filepaths textbox.
The macOS had to be corrected to ⌘ Cmd+L.
But I’m not sure the Linux Ctrl+L keybinding was confirmed.
The toggle seems to be implemented but the feature doesn’t work as one might expect.
When I toggle from breadcrumbs in a Windows OS file manager dialog, the text box is populated with the fully qualified filepath for the current folder. But in Gramps for Windows, the text box is blank. That seems wrong. (Sometimes the OS version demanded some weird additional steps when trying to populate with a fully qualified path but starting from a File Selector for relative paths. In Gramps, the add Media objects would be a relative path variation leveraging the Preferences’ Media base path.)
I’m not sure how much the technique Paul describes for using Environment Variables applies to just the CLI (or Preferences form fields) versus file location textbox in the Gramps dialogs.